The 0(0)(0)(B) over tilde B-2(1)-(X) over tilde (2)A(1) band of CaNH2 has been recorded at high resolution with a laser ablation molecular beam spectrometer. This (B) over tilde B-2(1) state is the last of the low-lying electronic states of CaNH2 to be characterized. The pure precession model, which has previously been used to describe the spin-rotation interactions in this family of molecules was used to interpret and correctly assign the spectrum. The detailed analysis of the high resolution spectrum and energy level structure of the (B) over tilde B-2(1) state is presented.