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Topeka police say son stabbed dad 57 times.

Kansas police encountered a grisly scene after responding to a frantic 911 call from a mother being attacked by her son, police records have revealed. 

Robert Fapp, 38, of Topeka, Kansas, stabbed his father 57 times before attempting to turn the knife on his mother, Katherine Fapp, who rushed to call 911 to explain to the dispatcher that her son was repeatedly stabbing his father, according to an affidavit obtained by KSNT. 

The affidavit also revealed that when police arrived on the scene on April 19, they found Katherine Fapp bleeding profusely on her front porch. Upon entering the home, they discovered her son, Robert Fapp, straddling his father, Ross Fapp, in an upstairs bedroom.

Robert was on top of his father as both struggled for control over the knife. Police stated Ross' hands were wrapped around the knife's blade as Robert continued to push the knife further into his father's chest, KSNT reported. 

Once restrained, police took him into custody, while Ross and Katherine were rushed to a nearby hospital to treat their injuries. Ross succumbed to his wounds a short while later. Medical staff confirmed that he had been stabbed a total of 57 times.

When questioned about what led to the horrific incident, Katherine told investigators she was painting in an office when her husband burst into the room shouting, "He's trying to stab me!"

Robert met his mother at the doorway, where he immediately attacked her with the knife, puncturing one of her lungs.

As Ross tried to jump between his son and wife, Robert then turned his attention back to his father.

The Shawnee County District Attorney charged Fapp with multiple charges, including murder in the first degree, premeditation, and attempted murder in the first degree, premeditation.