One of three suspects pleaded guilty Tuesday in connection with the gruesome killing of a transgender teenager in Texas County.

Isis Schauer, 18, pleaded guilty to second-degree murder in connection with the September stabbing death of 17-year-old Ally Steinfeld.

Schauer was sentenced to 20 years in prison. As part of the plea agreement, the charge against Schauer was lowered from first-degree murder to second-degree murder.

Two other suspects — Andrew Vrba and Briana Calderas — are awaiting trial on first-degree murder charges in connection with the killing.

A fourth person, James T. Grigsby, was charged with abandonment of a corpse and tampering with evidence in this case.

Court documents say Steinfeld was stabbed multiple times, including in the genitals. The teen also had her eyes gouged out and her body set on fire, according to court documents.

Authorities say Steinfeld's remains were found in a chicken coop near Cabool.

Following slaying of trans teen: What is deadnaming and why pronouns matter

'We are not going to forget her': Local LGBTQ allies gather to honor trans teen killed last month

Mom of slain transgender teen: 'I never realized how many lives she touched'