What the Law Commission’s Review of Homicide Law Means if you are Accused of Murder or Manslaughter

The law on murder is brutally simple and unforgiving.  

There is only one category of murder, regardless of the varying degrees of intent or circumstances, all carrying a mandatory life sentence. This ‘one-size-fits-all’ approach has drawn criticism for producing unjust outcomes. If you are convicted of murder a mandatory life sentence follows; and it’s a life sentence with a minimum starting point laid down by statute. This is an awful reality that can devastate the lives of those on the fringes of criminality, maybe someone caught up in an incident of violence and who did not themselves use a weapon or engage in an act of violence.  

The offence of murder requires an intent to kill or cause really serious injury. So, imagine a gang killing, let’s say involving the use of a knife. Now, think of the members of the group involved in the killing. First there is the ‘main man’ armed with a knife who inflicts a number of fatal blows. Then, compare him with a lesser participant, maybe a couple of years younger, who had no weapon, who used no violence, who had no intention to kill, but who did just enough in terms of support and encouragement to make him guilty. Both would be found guilty of the same offenceand the judge may have little option but to impose almost identical sentences. Surely that cannot be right? 

And it’s not just about joint enterprise. The law as it stands has not fully incorporated modern medical and social understandings, such as mental health conditions and domestic abuse dynamics. Previous partial reforms, including the 2009 Coroners and Justice Act, addressed some issues but left others unresolved.  

This is why the Law Commission, an independent body tasked with improving the law, is conducting this review to modernise and simplify homicide law while ensuring fairness and effectiveness. 

What Is the Homicide Law Review Examining? 

The review is comprehensive, covering all major aspects of homicide law including: 

Structure of Homicide Offences: The Commission is considering whether to introduce different degrees of murder (like first-degree and second-degree murder charges in the United States and Canada) to better reflect culpability and circumstances, potentially redefining manslaughter and murder distinctions.  

This goes to the heart of the concept of joint enterprise as at the moment lesser participants can be charged and convicted as principal offenders.  

Partial Defences to Murder:  

Partial defences reduce a murder charge to manslaughter if successfully proven. The review scrutinises existing partial defences: 

Diminished Responsibility: Abnormal mental condition impairing responsibility (e.g. psychiatric illness, trauma).  

For the defence to succeed, it must be established that  

1. the defendant was suffering from an ‘abnormality of mental functioning’  
2. which had arisen from a recognised medical condition, and  
3. (iii) that it had ‘substantially impaired the defendant’s ability either to understand the nature of their conduct or to form a rational judgment or to exercise self-control (or any combination)’ and  
4. it provided an explanation for their conduct. 

Loss of Control: Loss of self-control due to provocation or fear. For ‘loss of control’ to succeed as a defence there must be  

1. a loss of control,  
2. a ‘qualifying trigger’ and  
3. (iii) it there must be evidence that a person of the defendant’s sex and age, with normal levels of tolerance and self-restraint and in the same circumstances, might have reacted in the same or in a similar way. 

Suicide Pact: Killing as part of a mutual agreement to die together (extremely rare). Where someone, acting in pursuance of a suicide pact between themselves and another, kills the other or is a party to them being killed by a third person, that person is guilty of manslaughter as opposed to murder. Here the defendant has to show there was in fact a suicide pact, and the killing was in pursuance of the suicide pact and, crucially the defendant also had a settled intention of dying as part of the same suicide pact. 

For those currently charged, these defences remain vital and must be evaluated carefully under existing laws.  

Sentencing for Homicide Offences 

The mandatory life sentence for murder and its minimum term framework are under review. Murder is the only offence in England and Wales carrying a mandatory life sentence and it is also the only offence for which the sentencing framework is contained in legislation as opposed to Sentencing Guidelines prepared by the Sentencing Council.  

A Sentencing Judge is therefore limited following a conviction for murder to setting the minimum term an offender must serve. And the framework for determining that minimum term is contained within Schedule 21 of the Sentencing Code first introduced by the Criminal Justice Act 2003 (yes, over 20 years ago). There have been lots of piecemeal amendments made to the framework since then but no comprehensive review. The Sentencing Council on the other hand regularly reviews guidelines with changes regularly consulted upon. 

The Commission is assessing whether judges should have more sentencing flexibility and if the current sentencing guidelines fairly address cases, particularly those involving domestic violence. 

Modern Perspectives 

There are concerns over disparities for murders convicted in domestic abuse environments. The review references ‘inadequate reflection of prior abuse in minimum terms for abusive men who kill their female victims and disproportionately long tariffs for women who kill their male abusers’ . 

So, two different scenarios – male abusers who go on to kill their victim and female victims of abuse who following a period of what is sometimes referred to as ‘slow burn provocation’, they themselves kill their abuser.  

The Law Commission’s concerns stem from a growing recognition that domestic homicide cases differ from ordinary murders in systematic ways – ways that current law only patchily addresses.  

Scenario (1) involves perpetrators who have demonstrated heightened culpability (through a pattern of abuse, control, and betrayal of an intimate partner), which isn’t fully penalised under the present regime. Scenario (2) involves defendants who have significantly diminished culpability (due to being abuse victims themselves acting out of desperation), which isn’t adequately recognised by either defences or sentencing rules.  

Two significant cases 

The old case of R v Ahluwalia (1992), highlighted the “slow burn” provocation issue, loss of control in the context of domestic abuse and slow burn reactions;  

R v Challen (2019) demonstrated recognition of coercive control’s impact (murder conviction reduced to manslaughter). These cases illustrate why law reformers argue for clearer avenues of justice for abuse survivors.  

The Commission notes, the goal is a coherent approach where “gendered circumstances” are factored into the classification of homicide and its sentencing, instead of being obscured by rules “embedded with gender disparity” 

The review explicitly excludes issues like assisted suicide, euthanasia, and abortion laws, focusing solely on core homicide law. 

Key Milestones and Timeline of the Review 

The review runs from 2025 to 2028 and beyond.