Det Insp Ian Lott, of the Met's homicide and major crime command, said: "This was a devastating attack on two women in their homes". The unnamed victims, ages 66 and 33, were found with stab wounds in their north London home.
Scotland Yard said Joshua Cohen was spotted by a member of the public at about 2pm today after an appeal for information.
The Metropolitan Police said the man had been "eliminated from the investigation" and made a renewed appeal for witnesses. "Our investigation is ongoing".
United Kingdom police said they have caught and arrested a suspect in a double murder Friday in the London neighborhood of Golders Green following a media appeal for information. "We will continue to work with the Community Security Trust and keep them fully updated".
In a press release on Saturday 12 August, the Met police confirmed next-of-kin have been informed of the deaths.
Formal identification is due to take place but officers say they are confident they know the identity of the victims and that they are mother and daughter.
United Kingdom police were working with the Community Security Trust (CST), a Jewish charity that runs patrols to protect the Jewish community, to locate Cohen. "I would urge anyone who saw anything in the local area at the time of the attack to get in touch with investigators immediately".
Police had warned people not to approach the suspect but to call authorities if they see him.
Police described the jogger as a white man, aged early to mid 30s, with brown eyes and short brown hair, wearing a light grey t-shirt and dark blue shorts. Detective Chief Superintendent Simon Rose told citizens that additional foot patrols will be present in the surrounding area.
The incident room can be contacted on 0208 358 0200, or information can be reported anonymously to Crimestoppers on 0800 555 111.