An incident earlier this month in the eastern Iowa town of Belle Plaine, which killed a woman and her son, has been ruled a murder-suicide.

Teresa Gerleman and her eight-year-old son, Henry Fields, died when they were hit by a Union Pacific train early on the morning of May 4. DCI Agent Richard Rahn reviewed video footage from the train. It shows Gerleman stepping in front of the train and then pulling her son onto the tracks.

While the evidence gathered makes it clear Gerleman wanted to take her own life, Rahn said it may never be known why she chose to kill her son as well.