MADISON, Wis. -- Madison police said Thursday that a Middleton father left behind two suicide notes and called officers to the scene where he fatally shot his son and then mortally wounded himself.

VIDEO: Watch The Report

Officials said it was Ryan Dutter, 36, who called 911 on Tuesday morning, telling a dispatcher that there was a "dead guy" inside a vehicle that was parked in front of Haen Family Park.

Police said Dutter shot and mortally wounded his son, Kyle Dutter, 12, on Tuesday morning in a sport utility vehicle parked near High Point Road and Tree Lane on the city's West Side.

Ryan Dutter, 36, died Wednesday afternoon -- one day after his son's death -- at University of Wisconsin Hospital from a self-inflicted gunshot wound, officials said.

Late Thursday, police released the 911 call about the double shooting Tuesday.

On the short call, Ryan Dutter sounds calm and coherent as he tells the dispatcher he's reporting a "dead guy" inside a vehicle near a city park.

The 911 call shortly after 9 a.m. Tuesday led officers to a black sport utility vehicle parked at Haen Family Park on the far West Side.

Police found Kyle Dutter, who had developmental disabilities, and his father with fatal gunshot wounds.

A weapon was later recovered from the SUV as well as a couple of notes written by Ryan Dutter and addressed to family members.

Police said the notes confirm the father planned the double shooting but that they do not offer a clear explanation why.

"My understanding is they are relatively short notes. I can't get into the specific (language) of the notes, but they do indicate that this murder-suicide will take place. But (they do) not say why," said Joel DeSpain, public information officer for the Madison Police Department.

From the images, pictures and words on a Web site about the 12-year-old, Kyle Dutter seemed like an active, happy boy who was loved by his family.

Kyle Dutter apparently loved Halloween, and his paternal grandmother told WISC-TV that Kyle loved the park where his life ended. Rosemary Dutter said she believes her son Ryan picked that park because it was Kyle's favorite place to play and because it was peaceful.

"(Ryan Dutter) totally loved that child. He dedicated every moment of his life to him," said Rosemary Dutter. "I think he was thinking, 'I love this little boy. I'll take him to heaven and end his pain.'"

Rosemary Dutter and one of Kyle's grandfathers are adamant that the shootings had nothing to do with a child custody dispute over Kyle.

"He was an awesome father. I wish there was a better word. He was an awesome father," said Rosemary Dutter.

Ryan Dutter had been awarded full custody in January but had battled for years with Kyle's mother over custody.

Court records show the boy's father and mother divorced in 1999. Kyle Dutter's grandfather, Kenneth Bach, of Beloit, said Kyle lived with his father during the week and visited his mother in Beloit on weekends.

Records show that Ryan Dutter had recently been undergoing financial difficulties. He had been a mortgage broker and filed for bankruptcy last fall. A Web site Ryan Dutter created last summer includes information on the extensive medical help needed for his son Kyle, who had autism.

Funeral arrangements are pending.

Rosemary Dutter said that a memorial fund has been set up. People can send donations to:

Ryan T. Dutter Memorial Fund
c/o Municipal Credit Union
1154 Cranston Road
Beloit, WI 53511

The money will go to autism research and to implement a program called RETRO that Ryan Dutter detailed in a master's thesis he was working on at University of Wisconsin-Whitewater. It stands for "Retired Educators Teaching and Reaching Others." His idea was to have experienced retired educators work with parents of special needs children to help those children reach their potential.

Rosemary Dutter also said that Ryan Dutter donated his organs, and doctors at UW Hospital told the Dutter family that in the early hours of Thursday morning, five lives were saved.

Stay tuned to WISC-TV and Channel 3000 for continuing coverage.