“Transgender” is a broad term. Trans people have a gender identity different from the gender they were born with. “Trans” is a shortform for transgender.
When a trans person is murdered, identifying them as trans can be a problem. Sometimes they will called a transvestite, transsexual or transgender person. A person’s gender identity can be hard to get right, especially if they are dead and unable to say for themselves. These things are never set in stone, and they change depending on time, place, context and on who you’re talking to. Sometimes, years after a murder, the deceased will be identified as a different gender.
Some of the trans people who were murdered are: