Patrick, who was 25, was attacked by three people in masks just before 11pm on Thursday night on London Road.
He died of his injuries shortly afterwards.
MET Police are trying to establish if another incident there, on the night of September 23rd, where a white Volkswagen was damaged, was connected.
Officers want to speak to anyone who was on London Road in Morden late on the 23rd or early on the 24th or between 10pm and 11pm on Thursday 1st of October.