The LAPD is offering a reward of up to $50,000 for information that leads to an arrest and conviction in the incident.
The crash happened on Thursday just before 10 p.m. outside of the victim's parked motor home in the 3700 block of Union Pacific Avenue.
Police said the driver killed Cynthia Szukala, who was outside looking for her cat at the time.
The driver of the truck fled eastbound on Union Pacific Avenue without rendering aid as required by law, authorities said.
The suspect vehicle is believed to be a white 18-wheel tractor trailer.
Szukala's daughter told Eyewitness News that she forgives the person who killed her mom but pleaded for the person to come forward.
Anyone with information about the crash was urged to call Crime Stoppers at 1-800-222-tips.