In the US, most trans-identified males who are victims of homicide are killed by their male spouses, lovers, roommates in incidents of domestic violence that's been going on a long time, or by others they already know and have some kind of relationship with - sometimes coz they're partners in crime as you say. Not by straight men strangers they've randomly encountered, nor by straight men who've hired them for sex and have been hoodwinked into not knowing their sex beforehand coz they pass so well. Most trans males who do "sex work" do not pass as women, and most "straight" men who hire them for sex, or have sex with them in other circumstances, know exactly what they're getting into beforehand.

Moreover, the IPV and DV situations that occur between these homosexual and bi males is often two-way; it's not necessarily a matter of the trans person always being an entirely innocent victim picked on and abused by their non-trans partner, lover or roommate. Many trans-identified males grew up in violent homes, were abused as children and grew up to be violent, abusive people themselves. Many have hair-trigger tempers and fly off the handle and strike out in rage at the slightest perceived provocation or slight. Which is why so many threaten to injure, mutilate or kill anyone who disagrees with them, looks at them funny or doesn't "ma'am" them.

Also, plenty of trans identified males are known for getting in physical fights with each other. One of the few trans-identified males in the UK to die of homicide since 2008 was killed by another trans-identified male.