Lawler announced his decision on Tuesday. He joins quarterback Jared Goff as Cal players leaving school early to go to the NFL.
Lawler was a first-team All-Pac-12 selection this season. He had 52 catches for 658 yards and 13 touchdowns. In three seasons with the Golden Bears, Lawler had 143 catches for 1,706 yards and 27 TDs.
With Lawler's departure, Cal will be without its six leading receivers from last season.