TEMPE, AZ (3TV/CBS 5)-- Police have arrested a man after a woman, who was in the third trimester of her pregnancy, was stabbed to death overnight in Tempe.
According to Tempe Police, the man was arrested on westbound Interstate 10 at milepost 22 near Quartzsite just before noon Sunday.
The incident first occurred just after 1 a.m. at an apartment complex near University Drive and McClintock Road.
Police went to the apartment complex to check on a pregnant woman after witnesses heard screams in the parking lot.
"I heard a lady screaming for help, for someone to help her," said witness and apartment resident Jon DeGuzman.
"She was just screaming out for, 'Help, help' because she was stabbed,” said Vivek Sharma, who also lives in the complex and said the victim was knocking on his door asking for help.
Residents at the Omnia on 8th Street Apartments say they are still in shock.
“The lady was shouting in front of our house for help. She was banging the door. She was trying to get inside the house,” said Sharma.
"She kept on screaming so I came out with my roommate. She noticed the blood, followed the blood around the corner and she was up on the stairs bleeding out,” said DeGuzman, who helped give the victim first aide.
When officers arrived, they found a 39-year-old woman, who was at least seven months pregnant, stabbed multiple times.
She was taken to Scottsdale Osborn Hospital, where both she and her unborn baby died.
"I got some gloves, tried to do the best first aide as we could and tried to stop any bleeding," said DeGuzman, who was holding back tears as he described hearing the woman's cries for help.
He called 911 and then tried to help as the pregnant woman collapsed on a stairwell.
"I asked her what happened. She said she was stabbed. I asked her where and she said all over," said DeGuzman.
Police say the victim did not live in Tempe.
There are no other outstanding suspects.
Police have not released the names of the victim and the suspect at this time.