MADISON — A 30-year-old man was driving under the influence of crack cocaine and marijuana in October when his pickup truck veered off the road in Madison and hit a tree, killing one son, seriously injuring another and hurting two others in his family, according to an arrest affidavit.

Robert A. Simonds of Madison was arrested last week and faces charges that include manslaughter, criminal operating under the influence, aggravated assault and endangering the welfare of a child. He was held at the Somerset County Jail in Madison before being released Friday after posting a $100,000 bond.

Simonds was released on condition he not use or possess alcohol, illegal drugs or firearms. He was also ordered not to contact his two surviving children or their mother, Ashley Corson, 29.

Simonds, Corson and the children were returning from a visit with friends in Hartland on the night of Oct. 27 when Simonds’ Ford F-150 pickup truck veered off White School House Road at about 11 p.m.

The pickup traveled about 300 feet off the roadway and then hit a tree, according to the affidavit.

Kaleb Simonds, 7, was killed in the crash, and Keagan Simonds, 1, suffered a serious head injury, according to officials. Another child, Logan Simonds, 9, was also hurt. Robert Simonds and Corson also suffered injuries.

Robert Simonds was interviewed briefly at the scene by Deputy Jeffrey Brann of the Somerset County Sheriff’s Office. Simonds was then taken to Redington-Fairview General Hospital in Skowhegan.

Simonds told Brann he was traveling about 55 to 60 mph when he “dozed off,” according to the affidavit. A later investigation by the Maine State Police, however, determined the pickup truck was traveling faster than 80 mph. The speed limit in that area is 50 mph. There were no skid marks or indications of sudden braking prior to the crash, according to the affidavit.

Neither Simonds nor his children appeared to have been wearing a seat belt when the crash occurred, but officials at the time said Keagan Simonds, the 1-year-old, was in a child safety seat.

Brann, the investigator who submitted the affidavit in court March 20, said he interviewed a neighbor of Simonds who said Simonds was despondent and had made a suicidal comment.

Corson had told the neighbor a couple weeks before the crash she suspected Simonds had “relapsed on crack again” after finding corners to plastic baggies consistent with illegal drug packaging, according to the affidavit.

Simonds later admitted to a detective he had smoked crack cocaine with a friend in Hartland before returning with his family to Madison, the affidavit said. He had also smoked marijuana while at the Hartland home.

In addition to the crack cocaine and marijuana found in his system, a blood test also confirmed traces of Suboxone, a medication used to treat opioid addiction, according to the affidavit.

Brann said in the document that interviews with friends and neighbors revealed Simonds had been depressed about his relationship with Corson, and had made “suicidal and homicidal statements regarding his family.”

There was probable cause Simonds was “acting recklessly by operating a motor vehicle with unsecured children in the backseat after smoking crack cocaine,” Brann wrote in the affidavit.

Maeghan Maloney, district attorney for Kennebec and Somerset counties, said Simonds is scheduled to appear Aug. 7 at a court hearing in Skowhegan.

In the meantime, court documents show Simonds must reside with his mother in Athens and be under house arrest on weekends.