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The San Mateo County Coroner is seeking the public's help in identifying a man who was killed while crossing a Caltrain track at the East 5th Avenue crossing in San Mateo on June, 21, 2012 at 4:45 p.m. The man is described as white, 60-75 years old, about 5 feet, 5 inches tall, weighing about 130 lbs. He had gray hair cut in a military-type flat top, had a gray mustache and brown eyes. He was last seen riding a "Go-Go Pride Mobility Scooter" and a black Fumagalli pea coat, Old Navy Classic Fit button down black short-sleeved shirt, Old Navy Classic black pants, black socks and black leather dress shoes. If you can help identify the man, please contact the San Mateo County Coroner at (650) 312-5562.

SAN MATEO -- Authorities released sketches Tuesday they hope will help identify a man struck and killed on Caltrain tracks nearly three months ago.

The man, now dubbed John Doe No. 12-11, has remained nameless since he died near East Fifth Avenue in San Mateo June 21.

Authorities made various attempts, including a previous appeal to the public, to try and connect the man with his identity.

Up until now, investigators have been able determine John Doe was Caucasian, between 60 and 75 years old, about 5 feet, 5 inches tall, and weighed 130 pounds. He had brown eyes, gray or silver hair cut in a flat top style and a mustache.

A key piece of evidence is the electric wheelchair the man was using. It's called a "Go-Go Pride Mobility Scooter," but no information gleaned from the device has led to the man's name.

Authorities said that on the day he died, John Doe wore a black Fumagalli brand pea coat, Old Navy Classic Fit button-down, black short sleeved shirt and black Old Navy pants.

Anyone with information that can help identify John Doe can call the San Mateo County Coroner's Office at 650-312-5562.

Contact Joshua Melvin at 650-348-4335. Follow him at Twitter.com/melvinreport.