On April 9, 2001 an argument was heard from the Fisher home, however no signs of any violence were present at this time. At 10:43 pm that night, Robert was seen via an ATM camera as he took out $280. In the footage, his wife's car can be seen.
At 8:42 am the next morning, the Fisher house burst in a fiery explosion. Firefighters were immediately called to battle the 20-foot-high fire, in a desperate bid to prevent it from spreading to neighboring houses. A number of later, smaller explosions also occurred inside the house, which were believed to have been caused by rifle ammo or cans of paint.
Investigation revealed that Mary Fisher had been shot in the back of her head. Bobby and Brittney had each had their throats cut. Their bodies were found in a bed together within the smouldering rubble.
It was discovered that the gas line from the Fisher's furnace had been pulled. Gas had been building in the home, which is believed to have then been lit by Robert several hours earlier. This makeshift delay would have given the perpetrator a significant amount of time to escape.