Marvin Samuels 'raped stranger before killing ex-girlfriend'
A man raped a stranger walking her dog in a north London park hours before killing his ex-girlfriend, jurors hear.
The stranger bore a "resemblance" to Marvin Samuels's ex-girlfriend Sharlana Diedrick, whom he stabbed to death the same day in September last year.
Samuels, 31, of Stonebridge, admitted rape and causing grievous bodily harm with intent on the first victim, but denies her attempted murder.
He also denies the murder of Ms Diedrick.
Samuels claims he was not "mentally responsible" at the time of the attack.
The 42-year-old woman was walking her dog by Welsh Harp Reservoir in Neasden, when Samuels dragged her in to undergrowth, prosecutor Duncan Atkinson told the Old Bailey.
He also beat her with a bottle and a branch, causing her serious injuries.
Hours later, he attacked 32-year-old mother-of-four Ms Diedrick in her car. She was stabbed 16 times.
The first victim was "in the wrong place at the wrong time but had a resemblance" to the dead woman, the jury was told.
In his police interview Samuels said after he dragged his first victim in to undergrowth he felt like he was "lost in space" and was "feeling abnormal" when he attacked her.
The barrister said Samuels had "directed her to undress", tried to choke her with a scarf and then assaulted her.
The victim's "naked and badly beaten body" was found when her worried husband and others went looking for her, the court heard.
Ms Diedrick's body was found slumped in her car later that night.
Samuels had a "volatile" on-off relationship with her and they had a son. They had an argument about child care and he "lost it completely", the court heard.
Mr Atkinson said: "She was covered in blood and a blood-stained knife was found near her.
"She had suffered 16 stab wounds to the chest and abdomen."
During the police interview, Samuels claimed he "was not in his right mind that day".
The lawyer suggested that Samuels attacked the stranger because he was stressed about his problems with Ms Diedrick and added that the attack was brought on by "anger, frustration and stress rather than mental illness".
The trial continues.