A Florida man obsessed with mass shootings was charged with leaving dead animals – including a mutilated duck – at a Parkland school memorial near the site of the 2018 massacre, authorities announced Friday.

Robert Mondragon, 29, began his alleged assault of the Marjory Stoneman Douglas High School Memorial Garden after the July 18 start of gunman Nikolas Cruz's ongoing penalty trial in Fort Lauderdale. 

Jurors will decide whether 23-year-old Cruz, who already pleaded guilty, is sentenced to death or life in prison for the Valentine's Day rampage that left 17 dead.

A school crossing guard first noticed a duck with its cavity sliced open July 20 on a memorial bench.

PARKLAND SCHOOL SHOOTING: NIKOLAS CRUZ'S DRAWINGS FROM FLORIDA JAIL REVEAL DISTURBED MIND

Robert Mondragon's booking photo shows his face tattoos

A photo combination of Robert Mondragon's booking photo and the Marjory Stoneman Douglas High School Garden Memorial, where he allegedly left dead animals. (Broward County Sheriff's Office/  Leah Millis via Reuters)

The next day there was a dead raccoon in the same spot, and ten days after that a lifeless opossum, officials said.

A deputy pulled over Mondragon July 31 in a white Nissan Sentra for illegally tinted windows and allegedly saw bird feathers and blood on the front passenger side floorboard.

PARKLAND SCHOOL SHOOTER'S SISTER RECALLS DIFFICULT CHILDHOOD, SAYS MOM SMOKED CRACK, DRANK WHILE PREGNANT

"Mondragon told the deputy he had the dead bird in his car because he likes ‘the metal and blood smell that emit from the dead animal,'" according to a police report. 

Nikolas Cruz wearing glasses and a sweater vest in court

Nikolas Cruz, 23, in court Monday, Aug. 22, 2022, at his penalty trial.  (Amy Beth Bennett/South Florida Sun Sentinel via AP, Pool)

An investigation uncovered photos of Mondragon allegedly posing with the dead animals on his phone and surveillance footage captured his car at the memorial site.

The probe also revealed that the young man had an obsession with school shootings and has facial tattoos that resemble Tate Langdon's in "American Horror Story" – a TV series based on the Columbine High School massacre.

Authorities recovered evidence that in 2022 Mondragon eerily retraced Cruz's path the day of the Parkland shooting.

Mondragon is being held without bond on three counts of disfiguring a monument for defacing the memorial, according to the Broward County Sheriff's Office.

CLICK HERE TO GET THE FOX NEWS APP

He was first taken into custody Aug. 4 for violating a risk protection order and probation for  battery and indecent exposure, officials said.