aaron davis , head chef at the kitchen in florida , was killed while walking on saturday by suspected drunk driver jason lanard mitchell , police said .
mitchell , 25 , sped through several red lights before striking davis and his co-worker brian lafrance , who was treated and released from hospital .
ana granucci davis , 28 , wife of aaron , had second child andrew aaron lawrence on tuesday .
the couple , who married in 2013 , met four years ago and also have a 21-month-old daughter audrey .
mitchell faces several charges including dui manslaughter , vehicular homicide , aggravated fleeing and eluding and leaving scene of crash .