Ex-MLB pitcher Greg Swindell pleads for help to find his missing daughter and fears she is in danger with 'violent' ex-boyfriend

World Series-winning MLB pitcher Greg Swindell has made a public plea for help to find his daughter, Brenna, who he says has gone missing from Austin, Texas last week.

He and his wife Sarah have said they fear she is with her ex-boyfriend, Morgan Guidry, who they allege is 'violent' and 'is in trouble with law from when he assaulted her last month'.

They also said that Brenna left without making contact with her three children, which they claim she would never do without explanation. 

The mother-of-three has not been seen since last Thursday night and her missing white KIA was last seen on I-25 in Colorado on Friday evening, with possible sightings of Guidry and the van in Colorado Springs on Sunday evening.

It's unclear if additional tips came in over night, but Greg Swindell posted early Monday that the pair may have gotten as far as Idaho, urging people in the state to 'be on the lookout.'

World Series-winning pitcher Greg Swindell has made a plea for help to find his daughter

Branna Swindell (left) has gone missing from Austin, Texas and the family fear she is with her ex-boyfriend, Morgan Guidry (right), who they allege is 'violent' 

'Our daughter Brenna Swindell has not been seen or heard from in the Austin area since late Thursday afternoon,' the Swindell family said on Facebook . 

'Her phone is off and she has not been in contact with family, friends, and most importantly her children. Her ex-boyfriend in the photo has a warrant and is violent so PLEASE if you have seen or heard from either one of them, let us know. She drives a white Kia Carnival which has not been located yet.'

They later added an update: 'They were seen together Thursday night and we have managed to get a GPS on the KIA that is now in Colorado. Both phones seem to be there but both are turned off. License Plate VFS7528 White Kia Carnival.' 

Swindell confirmed that he had been in touch with Guidry's father, who had been cooperating and aiding with the search.  

'Please continue to pray for the safe return,' he added. 'Thank you all so much again.' 

Brenna was described as 5-foot-5, weighing around 120 pounds, with shoulder length brunette hair. 

Guidry (right) 'is in trouble with law from when he assaulted her last month'

Brenna is described as 5-foot-5, weighing 120 pounds, with shoulder length brunette hair

Brenna's missing white KIA Carnival (model pictured) was seen in Colorado 

She is also said to have distinguishable tattoos, including a sleeve of flowers on one arm and a spider web inked on the shoulder.

A later update from the family confirmed that a missing persons report had been filed with the Department of Public Safety with the Austin Police Department leading the investigation.

However, the family said they had no further leads beyond the car going through a reader in Colorado on Friday evening as both Brenna and Guidry's phones have been switched off. 

'Again, her boyfriend is in trouble with law from when he assaulted her last month and we don't know if she went with him willingly, was talked into running away with him, or what. I still feel she would never abandon her 3 children or just take off without explanation. So until we can prove otherwise, we feel she is in danger,' Sarah wrote in a joint Facebook post from family members. 

Left desperate without any encouraging leads, they continued to urge the public, especially those located in Colorado, to keep coming forward with tips 

'We SO appreciate all the leads and the offers of help from people in Colorado,' the family said. 

'But we have no idea where in Colorado they are, or if they are even still there. PLEASE keep the tips coming of any sightings or information.'  

Brenna is said to have distinguishable tattoos, including a sleeve of flowers on one arm

She also has a spider web and bats inked on her shoulder and two delicate butterfly tattoos

Swindell, a left-handed pitcher, enjoyed a 17-year career in Major League Baseball 

Swindell pitched for several teams, including Guardians, Astros, Red Sox and Diamondbacks

Swindell issued another plea later Monday morning, asking people in Idaho to be on the lookout, which suggests that there is belief Brenna could also be there. 

Brenna, a hair stylist at a salon in Austin, last posted on Facebook on August 13. 

Swindell, a Houston native, is a Texas Longhorn legend, and former Astros player. 

The No. 2 overall pick in the 1986 MLB draft made his Big League debut just weeks after the Cleveland Guardians selected him. 

A one-time All-Star, Swindell logged a 3.86 ERA in his career, pitching for several teams, including the Guardians, Reds, Astros, Twins, Red Sox and Diamondbacks.