Harris is the 31st trans American known to have died by violence this year.
Her death in Puerto Rico is the sixth known homicide of a trans person in the territory and the 30th in the U.S. this year.
New York City's hate-crimes unit is investigating.
Kee Sam (pictured) and Mia Green are the latest known transgender homicide victims in the U.S.
Activist Jasmyne Cannick said Buck should not be able to return to the scene of his alleged crimes: his home.
Burnett, whose best friend was murdered nine years ago, is at least the 27th trans American to die violently this year.