GLENDALE, Ariz. - Andres Reyes, 28, was arrested and could face charges of murder and vulnerable adult abuse after police say he “failed to provide medical assistance” that resulted in the death of his fiancée, who lived with quadriplegia, and their unborn son.

According to court paperwork, Reyes was the caregiver, employed with Blue Thumb Staffing, of his fiancée Bridget Charlebois at the time of her death. Charlebois was quadriplegic and used a wheelchair. She was unable to care for herself.

According to police, over several months in 2013, Reyes shot Charlebois multiple times with an air soft gun -- one with enough power to leave welts and penetrate skin if left unprotected.

On another occasion, according to police, Reyes allegedly left Charlebois by herself for over 12 hours without food or water in a soiled diaper full of urine and feces. According to court documents, a person who witnessed Charlebois in this condition rescued her.

Reyes told police, according to court paperwork, he knew Charlebois had fallen ill but said he did not know what to do and that Charlebois had refused treatment. Reyes also admitted to knowing Charlebois was three months pregnant, but did not report it.

According to court documents, an autopsy revealed that at the time of her death, Charlebois was carrying a healthy fetus and proper high-risk pregnancy treatment may have prevented the death of the unborn child.

Her mother Paula Charlebois said her family had no idea of the abuse or her pregnancy, and she wishes there is something she could have done differently before it was too late.

"I was so scared that she was going to be mad at me, and not talk to me, and shut us out, that I shut up," she said. "I shut up when I knew he was a bad guy. I didn't know how bad, but I knew he was a shady character."

Reyes had been fully trained in calling for medical assistance and reporting the pregnancy of patients, according to court records.

The victim's mother said Reyes called her to say Bridget was having trouble breathing and said he had already called an ambulance.

"When we got there, I knew [he didn't call] because there was no ambulance. There was no fire truck," she said.

Proper medical care, according to court documents, may have prevented the death of Charlebois.

During his initial court appearance, Reyes said "a lot" of what he is being accused of is "not true."

Reyes started to speak more before being reminded by the judge that what he says can be used against him in court.

His next court date is scheduled for May 23.