Running on Empty is a 1988 American drama film directed by Sidney Lumet and written by Naomi Foner and starring River Phoenix, Judd Hirsch, Christine Lahti, and Martha Plimpton. It was produced by Lorimar Film Entertainment. From Wikipedia
Phoenix's mother Arlyn Phoenix recalls his compassionate character, dedication to activism; his sister Rain also shares heartfelt tribute; River Phoenix Remembered as Voice for the Voiceless on with Impact Extending Beyond Hollywood.