Murderer
Old English morthor, of Germanic origin; related to Dutch moord and German Mord, from an Indo-European root shared by Sanskrit mará ‘death’ and Latin mors ; reinforced in Middle English by Old French murdre .
wiktionary
From murder + -er.
etymonline
murderer (n.)
"person who commits murder," mid-14c., mordrer, alteration of murtherer (early 14c.), agent noun from murder (v.); in part from Old French mordrere, from Medieval Latin murdrarius, from Germanic. Old English words for this included myrþra, morðorcwalu, morðorslaga, and morðorwyrhta, which is literally "murder-wright."
The original murderer's row was in New York City's Tombs prison; figurative use in baseball dates to 1858, though the quintessential one was the 1927 New York Yankees. Fem. form murderess attested from late 14c. Murderee (1920) never caught on.
