Authorities said Friday that a Woodbury man intentionally dropped his infant son headfirst on the ground in April, fatally injuring the 5-month-old.

The explanation he gave? The baby was crying and fussy and was being “difficult,” the man reportedly told investigators.

Matthew Hoisser, 35, of Woodbury, was arrested Friday, three months after the death of his son Gus. The infant suffered head injuries that included a skull fracture.

Hoisser has been charged with two counts of second-degree murder.

According to his obituary, Gus Christian Hoisser died on April 30.

The day after the alleged incident, the boy was dropped off at day care where later he was found "limp and quiet," the criminal complaint states.

The child was taken to Children’s Hospital in St. Paul and then transferred to Children’s Hospital in Minneapolis. He died five days later.

The cause of death was blunt force trauma.

During the baby’s autopsy, the medical examiner found a second head injury that had “occurred prior to the most recent injury … likely within a week or two of the infant’s hospitalization.”

Hoisser made his first appearance in court Friday afternoon. He did not speak during the 15-minute hearing except to say he has worked for a beer distributor the past six years.

Bail was set at $350,000 with the following conditions: no drug or alcohol use; submit to random drug testing; not possess any firearms or other deadly or dangerous weapons; remain law-abiding; make all future court appearances and have no contact with minors under the age of 18.

Second-degree murder carries a maximum sentence of 40 years in prison if there is a conviction.

Hoisser’s next court hearing on the charges is 8:30 a.m. Aug. 19. He was being held at the Washington County Jail in Stillwater Friday.