<P> Alice sees a vehicle pull up and rushes outside , thinking it is Steve . Instead , she is greeted by a middle - aged woman named Mrs. Voorhees , who claims to be an old friend of Steve 's . As Alice brings her inside , Mrs. Voorhees begins to reminisce that her son Jason was the young boy who drowned in 1957 . She blames his death on the counselors who were supposed to be watching him , but they instead were having sex and not paying attention to Jason 's drowning . Revealing herself as the killer , Mrs. Voorhees turns violent and rushes toward Alice with a bowie knife , attempting to kill her . In the ensuing chase , Alice finds Annie 's body inside Mrs. Voorhees ' car and Steve 's body hanging from a tree . Following a confrontation in which Mrs. Voorhees is knocked out , Alice escapes to the shore . Just as she begins to relax , Mrs. Voorhees finds her and attempts to kill her again with a machete . During the final struggle , Alice ultimately decapitates Mrs. Voorhees with her machete . Afterwards , a traumatized Alice boards and falls asleep inside a canoe , which floats out on Crystal Lake . </P>
<P> Alice sees a vehicle pull up and rushes outside , thinking it is Steve . Instead , she is greeted by a middle - aged woman named Mrs. Voorhees , who claims to be an old friend of Steve 's . As Alice brings her inside , Mrs. Voorhees begins to reminisce that her son Jason was the young boy who drowned in 1957 . She blames his death on the counselors who were supposed to be watching him , but they instead were having sex and not paying attention to Jason 's drowning . Revealing herself as the killer , Mrs. Voorhees turns violent and rushes toward Alice with a bowie knife , attempting to kill her . In the ensuing chase , Alice finds Annie 's body inside Mrs. Voorhees ' car and Steve 's body hanging from a tree . Following a confrontation in which Mrs. Voorhees is knocked out , Alice escapes to the shore . Just as she begins to relax , Mrs. Voorhees finds her and attempts to kill her again with a machete . During the final struggle , Alice ultimately decapitates Mrs. Voorhees with her machete . Afterwards , a traumatized Alice boards and falls asleep inside a canoe , which floats out on Crystal Lake . </P>
who did the killing in the first friday the 13th movie
who did the killing in the first friday the 13th movie
Mrs. Voorhees
Mrs. Voorhees