On Saturday , Houston police officer shot disabled man in head , killing him . Houston police chief : We place the highest value on human life , but shooting ` ` tragic '' Chief asks for FBI investigation ; promises ` ` transparency '' in response to shooting . Police representative said man had tried to stab officer with a knife .
On Saturday , Houston police officer shot disabled man in head , killing him . Houston police chief : We place the highest value on human life , calls shooting `` tragic '' Chief asks for FBI help ; promises `` transparency '' in response to shooting . Police representative said man had tried to stab officer with a pen .