Report details frenzied scene of fatal stabbing over Snapchat message

Officer responding to fatal Mt. Pleasant stabbing finds gruesome scene, woman with knife

MOUNT PLEASANT, SC (WCSC) - It was a gruesome scene and a tense moment when a police officer responding to a stabbing in Mount Pleasant came upon 17-year-old Lucas Cavanaugh lying on the road, and a woman running towards him with a knife in her hand.

On Sunday night, a Mount Pleasant police officer responded to the 1600 block of Baltusrol Lane in Park West for a stabbing.

According to newly released reports, the officer saw Cavanaugh lying on the ground with extensive wounds from cuts to his abdomen. Along with Cavanaugh, were two female subjects who were sitting with the victim.

The officer, who was armed with a rifle, then got out of his patrol car, approached the victim and asked the two females where the suspect was.

Police say one of the female subjects then came running towards the officer with a knife in her hand and screamed,"Here is the knife."

The officer reported that at the time he was not sure who the suspect was, so he pointed his rifle at the woman who was running, and demanded that she place the knife on the ground to which she complied.

The officer then observed that Cavanaugh still had a pulse and aided him by placing a trauma blanket over his injuries to stop the bleeding.

Investigators say the woman who ran towards the officers said the suspect was 16-year-old Matthew Fischer.

According to the woman, Fischer came into her house with a bloody knife, dropped the weapon in the home and ran away. The woman said she then picked up the knife, ran out of the home, saw the victim lying on the ground, and called 911.

A police report states a fireman approached the responding police officer and told him that the suspect's mother was on scene and needed to talk to him immediately.  According to Mount Pleasant police, the mother said she did not know what happened, but had the suspect in her vehicle. 

Officers then approached the vehicle and called the suspect out at gunpoint. Police say Fischer then complied and was taken into custody.

According to the Charleston County Coroner's Office, Cavanaugh of Sullivan's Island died at the scene from a stab wound.

Court documents state the whole incident started when Fischer, who was visiting his girlfriend in Park West, saw she received a Snapchat from Cavanaugh on her iPod. Fischer then used his girlfriend's iPod to message Cavanaugh, eventually saying "Come over" and "I'll kill you man," affidavits state.

According to documents, Cavanaugh arrived at the residence and the two got into a physical altercation. During the fight, Fischer pulled out a knife from his right pant pocket and stabbed Cavanaugh in the torso, investigators say. 

Police say Fischer confessed to the stabbing on video, and provided a written confession.

In addition to murder, Fischer has also been charged with possession of a knife during commission of a violent crime.

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