D12 rapper Proof was shot to death this morning (April 11) at a Detroit club that was operating illegally after hours, according to the Detroit Free Press. The artist, whose real name was DeShaun Holt

D12 rapper Proof was shot to death this morning (April 11) at a Detroit club that was operating illegally after hours, according to the Detroit Free Press. The artist, whose real name was DeShaun Holton, was 30. Another unidentified man was also shot and is in critical condition at Detroit's St. John Hospital.

Proof rose to prominence alongside Eminem and other D12 members over the past five years, and even served as the best man at Eminem's January wedding, the Free Press reports. He also appeared in Eminem's autobiographical film "8 Mile."

Proof's solo debut, "Searching for Jerry Garcia," was released in August 2005 on his own Iron Fist label. "I went back to the original flavor of hip hop that I remember, that I love," he told Billboard.com at the time. "[Where] people used samples, that kind of feel. Everything on there isn't a sample, but just the rawness I remember from '94, '95."

The artist is the second member of Eminem's inner circle to be shot in recent months. Rapper Obie Trice was shot while driving in Detroit on New Year's Eve but has since recovered from his wounds.