Police said the man being questioned had been kicked out of the nightclub at the Victor Hotel on Chicago's West Side, the Chicago Tribune reported. The man, who ran when police approached him, matched a description of the gunman, including being attired in a gray jumpsuit or tracksuit, police alleged.
Police said they found physical evidence linking him to the killings, though the man had not yet been charged in the 1:30 a.m. slayings.
Robert Warren, 34, and Jose Duckins, 30, both of Chicago, were fatally wounded in the chest. A 21-year-old man, whose name was not released, was shot in the arm and hospitalized in good condition.