[Updated at 10:18 p.m. ET] Millard South High School Assistant Principal Vicki Kaspar was pronounced dead at Creighton University hospital Wednesday night, Omaha Police Department Officer Michael Pecha said.

[Updated at 6:20 p.m. ET] An Omaha, Nebraska, high school senior shot his principal and an assistant principal Wednesday before police found him dead in his car, Omaha Police Chief Alex Hayes said.

Principal Curtis Case and Assistant Principal Vicki Kaspar were wounded in the shooting at Millard South High School, Hayes said.

Case is in serious but stable condition, and Kaspar is in critical condition, he said. Both are being treated at Creighton University Medical Center.

Hayes identified the suspect as Robert Butler Jr., the son of an Omaha Police Department detective.

CNN affiliate KETV reported that Butler posted the following statement on his Facebook page on Wednesday:

"Everybody that used to know me, I'm sorry, but Omaha changed me and (expletive) me up and the school I now attend is even worse. You are going to hear about the evil (expletive) I did, but that (expletive) school drove me to this. I want you guys to remember me for who I was before this. I know I greatly affected the lives of the families I ruined, but I'm sorry. Goodbye."

Lincoln Public Schools officials said Butler was enrolled at Lincoln Southwest High School last fall, but transferred to Millard South recently, KETV reported.

All the schools in the Millard School District were placed on lockdown after the shootings, but the lockdown has been ended, Omaha police spokesman Jacob Bettin said.