The MgCH3 radical was produced by a laser ablation/photolysis technique in a cold supersonic free-jet expansion and probed by laser induced fluorescence. Rotationally resolved spectra for both spin-orbit components of the (A) over tilde (2)E<--(X) over tilde (2)A(1) electronic transition have been recorded. The analysis of these spectra yields the rotational constants of MgCH3 and therefrom a structure for the radical is proposed. A comparison is made among a series of alkyl organometallic radicals.