Murphy was arrested early Tuesday at his Colorado Springs home in the stabbing deaths of his 5-year-old sister and 7-year-old brother.
All three were rushed to the hospital but doctors couldn't save the children.
The children's father, Jefferson Murphy, is being treated for nonlife-threatening injuries and is expected to survive.
19-year-old Malik Murphy appeared before an El Paso County judge for the first time Wednesday to hear what charges he's being held on. It's not clear if he has a lawyer yet. An arrest affidavit says the teenager bought a knife several months ago with the plan of killing his entire family and burying the bodies in the backyard.
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Murphy is being held without bond at the El Paso County jail.
After setting his parents' SUV on fire on March 30, Murphy was standing in a crowd of onlookers watching the vehicle burn, Fuesting said. Kibler did not return a call Tuesday seeking comment.
The boys are suspected of attempted first-degree murder after a shooting just before noon on September 22, police said. He also allegedly stabbed his father, according to Lt. Howard Black of the Colorado Springs Police Department. "They were great. They were just kids", she said.