52-year-old man wanted in killing of Brooklyn mother

A Brooklyn mother that had been in a coma after falling down the stairs in an attempted robbery has died.
Police have identified the man they are looking for as 52-year-old David Robinson.
On July 17, police say Robinson approached the 58-year-old woman and her son inside the Broadway and Canal station and attempted to steal a bag. During the struggle, the mother and son fell down a flight of stairs.
The mother was hospitalized but did not survive her injuries.
Anyone with information on this incident is asked to contact police.