6:10 PM PT -- Courtney's lawyer, Frank Prieto, tells TMZ ... her arrest is shocking because they believe there is clear evidence of self-defense.
Her lawyer claims Obumseli attacked and choked Courtney, leaving her "no choice but to meet force with force."
CT's attorney says she's been cooperating with the police investigation and offered to turn herself in if criminal charges were filed ... another reason they are disappointed in her sudden arrest.
We're told Courtney was seeking treatment in Hawaii for PTSD and other issues related to the case ... and her lawyer claims she is a victim of domestic violence and human trafficking.
OnlyFans model Courtney Tailor has been charged with murder in connection to the killing of her boyfriend earlier this year.
Tailor was reportedly arrested in Hawaii on Wednesday on a second-degree murder charge. She's said to have been in rehab there but, according to her attorney, who spoke to the Miami Herald, she's expected to be extradited to Florida soon.
Her lawyer adds ... "I'm completely shocked, especially since we were cooperating with the investigation and offered to voluntarily surrender her if she were charged. We look forward to clearing her name in court."
The arrest comes months after authorities were investigating the stabbing death of Christian Obumseli -- who was found deceased in the couple's Miami apartment. Tailor had previously told cops she did, in fact, stab him with a knife ... but insisted it was in self-defense.
Surveillance video from inside shows Tailor, after the fact, covered in blood from head to toe.
It initially seemed as though her explanation had worked, but now prosecutors apparently think there is enough evidence to prosecute her. Obumseli's family has insisted all along that they believe she killed him in cold blood.
Things weren't looking good for her, publicly, in the immediate aftermath of the incident. People dug up old interviews of her saying questionable things -- and she got confronted in a hotel lobby by an outraged bystander.