David Bennett, a 57-year-old suffering from terminal heart disease, was convicted of the 1988 bar stabbing of Edward Shumaker,.
Bennett struck Shumaker from behind then stabbed him repeatedly in the abdomen, chest and back, according to court testimony cited by The Washington Post.
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Human heart transplants have revolutionized treatments for terminally ill cardiac patients for the last , but a has meant that every year, thousands are left with no other option than to wait on a seemingly endless waitlist.
Bennett will continue to be monitored in the coming weeks but has appeared to be doing fine in the three days since surgery.
Still, Klassen cautioned that it was only a first tentative step into exploring whether this time around, xenotransplantation might finally work.