The man would be king

No, no, no. Ack, ack, ack. Lots of relative clauses can be legitimately reduced. This is none of them:

A man who gunned down three people in a S.C. Department of Social Services office in 1996 was executed by lethal injection Friday.

If anyone in readerland can come up with a national or regional flavor of hed English in which this would be grammatical, pls check in.

Grammar: Ur not just doin it wrong, ur scarin the kittehs. Stop.