The killer, a hired assassin, commits suicide before he can be identified.

Harry comes very near to being killed himself - but eventually the killer commits suicide.

The killer had committed a perfect murder.

The Executioner had waited until the killer had committed to firing before he took action.

Can the Senator cite one case in which a killer committed still another murder after he was executed?

MO is how the killer commits the crimethe boring details.

Serial killers commit clearly separate murders, happening at different times.

A killer could walk into such a place, commit atrocities, and walk out again without anyone noticing the difference.

Their only hope was that the killer would turn himself in, commit another crime in front of witnesses or tell someone about the stabbing.

The average killer would commit murder openly, and take his chances on a get-away.