NEW YORK (CBSNewYork) — A 20-year-old University of Pennsylvania student from Teaneck, N.J., is missing.

Timothy Hamlett was last seen by his parents in Teaneck on Dec. 26 at 6 p.m.

Hamlett is a 6-foot-tall black male. He was wearing True Religion jeans, a blueish, purple zip-up Adidas sweatshirt and sneakers.

He has a change in behavior due to an overuse of athletic supplements, according to his mother as well as a neurologist.

Timothy told his parents he was going to see a friend who lived in Teaneck before he left his home, according to police.

His last known cell signal was near the George Washington Bridge and the Washington Heights area between 170th and 182nd streets around Broadway, police said.

His cell phone no longer has power.

His disappearance is being investigated by the Port Authority Police and Teaneck police.

If you’ve seen Timothy or have any information as to his whereabouts, please call the Teaneck Police Department at 201-837-2600, or call 917-686-0087, or 201-406-6990.

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