The father of two toddlers who died after a dresser fell on them is facing involuntary manslaughter charges because he heard a crash and didn't immediately check on his daughters, a prosecutor said yesterday. David Beatty, 28, of Aliquippa, Pa., is charged in the deaths of 2-year-old Brooklyn and 3-year-old Ryeley. Brooklyn died shortly after the dresser fell on her July 4, and Ryeley died two days later in a Pittsburgh hospital. Beatty was home alone with the girls and acknowledged he didn't check on them for 10 to 15 minutes after hearing the crash, the DA says; Beatty says he was using the toilet at the time. The dresser weighed 124 pounds, and the girls about 30 pounds each.