The funeral will take place Monday, Dec. 17, at the same church starting at 11 a.m. She also said her stepdaughter was about six months pregnant when she died. They eventually discovered Rouhselang's body behind Pasquale Rulli's restaurant a block from her home.
Arendt said that Breana knew Trejo, who also attends Mishawaka High School, from the football team, but the extent of their relationship was under investigation.
The teen suspect is now charged with murder.
Alex Arendt of the St. Joseph County Metro Homicide Unit said Trejo is in custody at the St. Joseph County Jail and is being held without bond.
Her family called police about 4.30 am Sunday after they 'got the feeling that something wasn't right, ' Arendt said.
"Aaron Trejo quietly said, 'Yes, '" before explaining that "Breana waited too long" to tell him about the pregnancy for her to be able to get an abortion, the affidavit states.
In his confession, he told authorities he chose to use a knife, which he brought from his home, "because he thought it would kill Breana quickly", according to court papers.
Pregnant cheerleader Breana Rouhselang is being mourned by friends and family
"I took action. I took her life", Trejo allegedly said. Trejo initially told police Breana did not show up to their planned meeting.
Aaron Trejo, 16, was formally charged Monday with two felonies, murder and feticide, following his arrest the day before.
Authorities say Trejo stabbed Rouhselang during a fight over her pregnancy, put a plastic bag over her and put her body in a restaurant dumpster in their hometown of Mishawaka, which is next to South Bend and about 80 miles (130 kilometers) east of Chicago. His arraignment was scheduled for 1 p.m. on Tuesday.
Trejo also admitted he brought the black plastic bag he used to cover Rouhselang's head from home, knowing he would use it "for that objective", police said.
An autopsy found that Rouhselang died from multiple stab wounds, and that a scarf she had been wearing at the time was tied so tightly that she was being strangled before she died, according to the affidavit. "The Rulli family are upset that this took place in our neighborhood and are saddened for our Mishawaka city", read a statement from the restaurant on Facebook.
Meg Sauer, communications officer for the school district, told The Indianapolis Star in a statement that "we're just focusing on healing the kids." "No one can ever be prepared for a loss like this".