Motive Season 3 Episode 1

The killer: Derek Caster, the victim: London Montgomery
London is the daughter of wealthy industrialist Neville Montgomery. She is now six months removed from drug rehabilitation and has kept herself clean. She wants her upcoming birthday party to double as a drug facility fundraiser. After the party, she is found dead in an alley from drug poisoning. Derek is a 'fixer,' a man paid to make problems disappear. Additionally, Vega has to recuse himself from the case when he discovers that the victim's last contact was with his father, Franco.