PACIFICA (CBS SF) — Two people have been arrested in connection with several drug-related crimes following the death of a man last year from an overdose of fentanyl.

Ronald Johnson, 50, and Lisa Anderson, 48, were arrested Thursday on suspicion of sales of a controlled substance, maintaining or operating a drug house, conspiracy and inflicting great bodily harm, according to the San Mateo County Sheriff’s Office.

In March, deputies began an investigation into the death of Aaron McGregor, a Montara resident who died last year from a lethal dose of

Investigators identified two suspects responsible for selling McGregor the fentanyl, deputies said.

On Thursday, detectives obtained arrest warrants for Johnson and Anderson and a warrant to search their residence in Pacifica.

Both suspects were taken into custody without incident, and a search of their residence resulted in the seizure of 15 firearms, suspected
fentanyl and additional paraphernalia, deputies said.