Published: Aug 26, 2013 4:19 PM EDT

COLLIER COUNTY, Fla.- The Collier County Sheriff's Office is asking for the public's help locating a 21-year-old East Naples man who has been missing since Monday morning.

Detectives said Joshua Longo was last seen by his parents leaving their home in the Lely community around 10:30 a.m. He was on foot.

Detectives said family members believe Longo may harm himself.

It is possible Longo may be in the Kings Lake area of East Naples, detectives said.

Longo is described as white, 5 feet 7 inches tall, 160 pounds, with black hair and brown eyes. He has tattoos on his forearms and lips tattooed on his neck.

Anyone with information on Longo’s whereabouts is asked to call the Collier County Sheriff’s Office at (239)252-9300.