Dead Head Fred review at Gamespy.

"Don't lose your head!" Words of wisdom to live by. Unfortunately, they came a little too late to private eye Fred Neuman. As the protagonist of D3 and Vicious Cycle's new PSP game, Dead Head Fred, Fred starts his adventures not long after getting himself whacked by a local mob boss. Brought back to life through the warped experiments of Dr. Friedrich Steiner, Fred finds himself missing his memory... and his head. Facing off against mutants, zombies and other threats both scientific and supernatural, it's up to Fred to uncover the truth behind his death, save the city, and lop off a few extra heads in the process."

Full Source: Gamespy