Detroit police are asking for help with finding a man with a mental illness who has been missing for nearly three weeks.

Nikko Staffeld, 28, was last seen May 4 around 3 p.m. in the 1200 block of Linwood Street.

Police say Staffeld’s mother has been unable to contact or find him and is concerned for his well-being. His mother said he has a mental illness.

Staffeld is described as between 5-foot-7 and 5-foot-8 and about 200 pounds. He has brown eyes, hair hair and a reddish-brown goatee.

What he was last wearing is unknown.