He told police he saw a flashlight shining through the door and a man, later identified as Nix, trying to crawl through.
Court documents say the Phoenix homeowner shot Nix with a taser and kicked him in the face during the incident, which occurred at about 4 a.m. Sunday, according to ABC 15 and CBS 5.
The homeowner contacted police and told them a man entered his house through a dog door.
A short time later, police found the two players and arrested them.
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Cosgrove, 23, was a was a 12th-round pick by the Padres in 2017 who pitched for the Padres' Class A affiliate in Lake Elsinore, Calif. Nix said that he usually enters his home through the front, and that none of his doors have a doggy door.
Speaking to police, Nix said he and Cosgrove had been out that night and dropped off by a rideshare at a house he believed to be his home.
Nix dropped his phone inside the home, and verified to police it was his when he was being booked into jail, the police report said. Online records show NIx does not have an attorney.
The Padres issued the following statement on the incident: "We are aware of the alleged incident involving Jacob Nix last Sunday in Arizona". Nix was arrested and is being charged with criminal trespassing. After suffering a ligament tear in spring training, he began making minor league appearances in July and he has been participating in the Arizona Fall League with the Peoria Javelinas. "Due to ongoing legal proceedings, we will not have any further comment at this time". He has a preliminary court hearing scheduled for October 16.