An Indiana teenager pleaded guilty Wednesday to murdering a high school cheerleader who was pregnant with his baby, according to a report.

Aaron Trejo, 17, pleaded guilty during a scheduled status hearing, according to WSBT-TV. Trejo was accused of stabbing 17-year-old Breana Rouhselang and their unborn baby last Dec. 8. The high school football player told police that the two had argued about the pregnancy on the night of her death, Fox 59 reported.

In charging documents obtained by Fox News, South Bend Detective Gery Mullins wrote that Trejo told him that “Breana waited too long to tell [him] about the pregnancy to get an abortion. I asked Aaron what he did about that, and he replied, ‘I took action … I took her life.’”