Ramon Nunez is accused of selling drugs to two teenagers who were hospitalized Saturday. Officials are still investigating whether he’s responsible for the deaths of two other teens that same day.

Santa Rosa authorities announced that at least two teens have died and two others were hospitalized following possible fentanyl overdoses over the weekend, with police making an arrest.

Four teenagers in Santa Rosa overdosed on suspected fentanyl over the weekend, and two died, police said Sunday night.