What are the "facts" regarding Hyde's beating Carew to death?

The maid sees an aged man with white hair walking along a nearby path. She watches as he meets another, smaller man, whom she recognizes as Mr. Hyde. Suddenly, Mr. Hyde brakes out in anger and attacks the white haired man, beating him to death with a cane. The maid faints upon witnessing such horror. When she awakes a few hours later, she immediately calls the police, who find the victim's body.