A northern Indiana man faces charges after allegedly causing his girlfriend’s death with a lethal fentanyl dose.

Court documents reveal that 45-year-old Jeremy Duvall is accused of dealing a controlled substance leading to death, as reported by Law&Crime. Although the charge was levied this week, the tragic event reportedly took place during the summer months.

On June 27, Duvall and his girlfriend, 29-year-old Keana Swafford, were inside a residence in Fort Wayne, Indiana. According to court documents, Duvall claimed he witnessed Swafford smoking fentanyl by the bed before he drifted off to sleep. Upon waking, he discovered her unresponsive, face down on the floor, as detailed by local news outlets ABC and NBC affiliate WPTA.

Duvall, whom authorities suspect was involved in drug dealing at the time, hesitated before dialing 911. He eventually called for help, but when emergency personnel arrived, he was not present. Despite efforts to revive Swafford, she was declared deceased at the scene.

Investigators secured a warrant to search Duvall’s phone, uncovering messages that they believe shed light on his mindset regarding his girlfriend’s untimely demise.

“Trust me there hasn’t been a minute that past where I haven’t thought about what could have been done differently,” one message read, per the Fort Wayne-based outlet. “I would give my life for hers and she knows that God knows that and God and [Swafford] knows what happened that’s all that matters I don’t care what anyone has to say or feels about it.”

In another message, Duvall admitted to giving his girlfriend the fentanyl, according to the court documents.

Duvall was arrested a month later for felony narcotics possession, and on the way to the jail, he allegedly made an incriminating statement: “It is kinda like my fault.” He has reportedly remained in jail since.

Court records show that the defendant had an initial hearing for his dealing charge on Friday. He will appear in court again on Nov. 26.

Swafford, who had three children, is remembered for being “bright, bold, and fierce in her love for those around her,” according to her obituary, which also mentions Duvall.