photo by: Leavenworth County Sheriff's Office

Miles Clasen

A known drug offender denied giving a vulnerable woman the fentanyl that killed her, but evidence from several cameras and a cellphone led Lawrence police to believe he is the only person who could have done so, according to a recently released arrest affidavit, which also indicates that police had responded no fewer than six times in seven months to overdose-related medical calls associated with the man and his roommates.

The drug offender, Miles Clasen, 25, was charged in October with distribution of a controlled substance causing the death of 21-year-old Olivia Mae Hassell, who died on July 7, 2025.

Clasen had been sentenced in April of this year to 12 months of probation in Leavenworth County for unlawful possession of fentanyl and possession of drug paraphernalia. He was serving that sentence when he was charged last month in Hassell’s death, and he has multiple other pending drug charges in Douglas County, according to court records.

According to allegations in the arrest affidavit, which have not been proved in court, Clasen and Hassell communicated extensively via messaging apps on the day of her death. Hassell, who had been trying to get sober and was “alleged to have been clean for approximately one month,” desperately reached out shortly before 11 a.m. to Clasen, with whom she had “an on again off again domestic relationship,” according to police.

She told him that she needed drugs immediately and indicated several times — and in graphic terms — that she felt suicidal. She specifically begged that he bring fentanyl. Clasen messaged her back shortly before 4 p.m. and the two shared a 2-minute phone call. Around 5:15 p.m. Clasen messaged that he was waiting for a ride to get to her house.

The messages were retrieved by police on Hassell’s phone after she died from what a medical examiner termed acute fentanyl intoxication.

According to the affidavit, Clasen indicated that he had never given Hassell fentanyl and had not done so on the day she died.

However, security camera and doorbell camera footage obtained by police showed Clasen arriving at Hassell’s residence shortly after 6 p.m. and staying until about 7:45 p.m. An eyewitness also indicated that he saw Clasen leave the residence at 7:45 p.m., according to the affidavit.

Hassell’s desperate requests for drugs throughout the day were evidence to police that she did not have any in the house until Clasen arrived. She reportedly fell unconscious later that evening, and police responded shortly before 10 p.m. to a cardiac arrest call. Hassell was taken to a hospital, where she was pronounced dead.

According to Lawrence police, Hassell was unresponsive when they arrived, and several doses of Narcan failed to revive her. A man identified as her significant other told police that he suspected that the drug she smoked had contained a substance called “tranq,” aka xylazine, which he said was resistant to the effects of Narcan.

In the affidavit, which is a sworn document detailing an officer’s reasons for making an arrest, Officer Garrett Welch indicated that he was aware of Clasen’s “involvement in the distribution of controlled substances in Lawrence.” Welch specifically cited six separate instances between December 2023 and July 2024 — a year before Hassell’s death — that Lawrence police had responded to overdose calls related to Miles, Hassell “or one of their other two roommates” at the time.

When he was arrested in connection with Hassell’s death, Clasen was allegedly found with fentanyl in his possession, leading to separate charges being filed. He was also out on bond at that time in yet another Douglas County drug case.

Clasen is currently being held in the Douglas County Jail on a bond of $200,000 cash or surety. His next court appearance is scheduled for Nov. 25. He is being represented by court-appointed attorney Razmi Tahirkheli.

Clasen is the son of Lauren Reinhold, who recently lost her bid to represent Kansas’ 1st Congressional District to incumbent Rep. Tracey Mann.