SACRAMENTO -- The family of a Bay Area man who has a severe traumatic brain injury is asking for the public's help in locating him.

Sean Sidi, 19, was reported missing from San Francisco on May 21. Recently, he was sighted in the downtown Sacramento area, according to the family.

Doctors have told family members that Sidi's medical condition puts him at significant risk of death if he is not found soon.

A $5,000 reward has been offered for information about Sidi's location. If found, call 911 or his mother, Lynn at (415) 713-5913. San Francisco police can also be contacted at (415) 713-5913