A man who already had convictions for killing his wife and a former partner has pleaded guilty to murdering his ex-girlfriend.
At the Old Bailey, Theodore Johnson, 64, admitted beating Angela Best with a claw hammer and throttling her with a dressing gown cord.
Johnson has two previous manslaughter convictions: one for pushing his wife over a balcony in 1981 and one in 1993 for strangling a partner.
He will be sentenced on Friday. The garage worker threw himself in front of an express train after attacking Ms Best, 51, at his Islington home on 15 December 2016, but survived.
Police only discovered the body of Ms Best when they called at Johnson’s north London flat to find his next of kin after the incident at Cheshunt railway station.