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A Boston man pled guilty on Sunday to conspiring to distribute cocaine, fentanyl, and heroin — some of which was delivered to a Harvard biology lab in 2019.

Former FedEx employee Lennon Carrasco pled guilty to one count of conspiracy to distribute and to possess with intent to distribute fentanyl, heroin, and cocaine. Dorian Rojas — Carrasco’s co-conspirator and fellow former FedEx employee — was sentenced to 10 years in prison in October 2022.

In June 2019, law enforcement discovered a FedEx package containing one kilogram of fentanyl and one kilogram of cocaine delivered to a biology lab on Harvard’s campus. An investigation found that Rojas asked Carrasco to retrieve and deliver the package to him. Carrasco was arrested in August 2019 after he was seen retrieving another package containing one kilogram of heroin and delivering it to Rojas.

Following an investigation, authorities concluded that Carrasco retrieved more than 20 FedEx packages for Rojas from November 2017 to June 2019.

Carrasco originally pled guilty in April 2022 to conspiracy to distribute 400 grams or more of fentanyl, 10 grams or more of heroin, and 500 grams or more of cocaine — an offense that carries a mandatory minimum five-year prison sentence.

In September 2023, he withdrew the guilty plea, citing his mental health status among other reasons. Under the new deal, Carrasco pled guilty to lesser charges without alleged drug weight and will not face a mandatory minimum prison sentence.

Carrasco’s lawyer Paul J. Garrity did not respond to requests for comment.

U.S. District Judge Richard G. Stearns ’80 scheduled Carrasco’s sentencing for June of this year. He faces a maximum of 20 years in prison, up to a lifetime of supervised release, and up to $1 million in fines.

—Staff writer Sally E. Edwards can be reached at sally.edwards@thecrimson.com. Follow her on X @sallyedwards04 or on Threads @sally_edwards06.

—Staff writer Asher J. Montgomery can be reached at asher.montgomery@thecrimson.com. Follow her on X @asherjmont or on Threads @asher_montgomery.