Sarah Everard's parents are attending a Court of Appeal hearing where her killer, Wayne Couzens, and four other murderers are having their sentences reviewed.
Couzens, a former Metropolitan Police officer, has appeared by video-link from HMP Frankland, wearing a prison-issue grey jumper and with a long, bushy, grey beard.
Couzens, 49, was handed a whole life order last September for the abduction, rape and murder of Ms Everard in March 2021.
He may have used COVID-19 lockdown rules as an excuse to stop Ms Everard, a 33-year-old marketing executive, as she made her way home.
A whole life term is handed down in the most serious cases when a judge believes a person should never be considered for release.
Emma Tustin and Thomas Hughes, who were jailed for 29 and 21 years respectively in December 2021 for the murder of six-year-old Arthur Labinjo-Hughes, will also have their sentences reviewed after they appealed their jail terms.
However, the Attorney General Suella Braverman has also made an application for their sentences to be reconsidered in case they were "unduly lenient".
Ms Braverman has also made an application for the sentence of Jordan Monaghan, who was jailed for a minimum of 40 years for murdering his partner and two young children, to be reconsidered to see if it is unduly lenient.
Five senior judges are set to review the sentences at the Royal Courts of Justice on Wednesday.
Couzens was handed a whole life order in September for the murder of 33-year-old marketing executive Ms Everard.
The Metropolitan Police firearms officer used his warrant card and handcuffs to kidnap her as she walked home, using COVID-19 lockdown rules as the premise for a false arrest in south London.
Stewart murdered his wife Diane Stewart in 2010 before murdering his fiancee Helen Bailey six years later.
The double murderer denied killing Mrs Stewart who died at their family home in Bassingbourn, Cambridgeshire, on 25 June 2010.
The 47-year-old's cause of death was recorded at the time as Sudden Death in Epilepsy (Sudep).
Police reopened the case after Stewart was convicted of the murder of his fiancee, children's book author Helen Bailey, whose body was found in the cesspit of the £1.5m home they shared in Royston in Hertfordshire in 2016.
Tustin and Hughes were each jailed after Arthur, who was Hughes' son, was poisoned, starved and beaten to death in a prolonged campaign of "evil abuse" in Solihull, West Midlands.
Monaghan, 30, obstructed the airways of daughter Ruby, aged 24 days, and Logan, 21 months, in January and August 2013.
Both murders took place in Blackburn, Lancashire.
Six years later, the gambling addict killed his new girlfriend, Evie Adams, 23, with a drug overdose.