POLICE warned a Missouri fire captain that they would be taking his phone to look through his texts while investigating the death of his fiancée, phone calls obtained by The U.S. Sun reveal.

Mom-of-four Grace Holland, 35, died in the home of Robert Daus in 2020, years before 39-year-old podiatrist Sarah Sweeney’s body was found in his second St. Louis residence.

On July 22, 2020, Maryland Heights Fire Department Captain Daus called 911 to report that Holland had shot herself while they were at home together.

Her body was found inside his home in Creve Coeur, a suburb of St. Louis, and her cause of death was deemed a suicide, according to the medical examiner’s report.

The two were on-and-off for around four years and had a turbulent relationship, according to Holland’s twin sister Laura, who said she had to move her out of Daus’s home multiple times.

Daus told responding officers that Holland had been depressed after suffering multiple miscarriages and was upset that he didn’t want to try for another baby, according to a police report seen by CBS affiliate KMOV.

The Creve Coeur Police Department briefly looked into Holland’s death, and ultimately sided with the medical examiner.

No charges have been filed against Daus, and he’s never been named as a suspect by cops.

However, their findings are being contested by Holland’s family, who alleged in a lawsuit that he either killed the mom or drove her to suicide through abuse.

WARNING CALL

Phone calls obtained by The U.S. Sun reveal conversations that CCPD Detective Charles Parker had with Daus, as well as Holland’s ex-husband, father, and sisters.

After Holland’s death on on July 22, Detective Parker called Daus on August 4 to warn him that they would be coming to his home to collect his phone.

The department had been trying to get access to Holland’s phone but said that they couldn’t get in because no one knew her password.

“We’ve got her phone, but it would be a little bit difficult and expensive to download,” Detective Parker said.

Parker asked if there was a text thread between the two of them on Daus’s phone, and Daus replied that there was.

The detective then said they would stop by his home so they could take pictures of his text messages.

The U.S. Sun has viewed some of these messages and saw that Daus and Holland’s sister Laura discussed getting her mental health treatment.

When asked about Detective Parker warning Daus about viewing his phone, Creve Coeur PD’s Captain Jeffrey Hartman told The U.S. Sun they could not comment as there is another ongoing investigation.

Last year, Captain Hartman requested that the St. Louis County Police Department take a fresh look at Holland’s case after her family voiced frustrations with how the investigation was handled.

Now, that follow-up investigation is being reviewed by the St. Louis Prosecuting Attorney’s Office, which will decide whether charges should be filed.

When asked to comment on the investigation, a spokesperson for the prosecuting attorney’s office told Fox News that they’ve deemed Holland’s death suspicious.

The U.S. Sun has reached out to Daus for comment on the text messages, but he hasn’t responded to multiple past requests.

DOCTOR DEATH

The fire captain is under intense public scrutiny after Sweeney, 39, was found dead inside his new home in the nearby suburb of Westwood on January 13.

Sweeney had reportedly been taking Daus for around two years before her death.

She suffered from a “life-threatening condition,” according to her lawyer, but her autopsy results are still pending and the investigation is ongoing.

Sweeney’s mother told Fox News that they hadn’t heard from her in two years, ever since they told her to stay away from Daus after reading about Holland’s death.

The Frontenac Police Department told The U.S. Sun that Sweeney’s death was unexpected and there were no outward signs of trauma.

Daus is fighting a lawsuit filed by Holland’s daughters and ex-husband and has denied their accusations.

He filed a response to their suit and is trying to get it thrown out.

In the wake of Sweeney’s death, Grace’s heartbroken twin exclusively told The U.S. Sun, “I feel like I failed to protect Sarah from the same abuse Grace suffered.”

“I feel responsible. I feel like I didn’t do enough with Grace’s case,” Laura said.

She said she’s been in touch with Sweeney’s family and that the tragedy reopened old wounds over her sister’s death.

“I had taken Grace away from him four times. I’d move her in and out of his house, and he’d always come back,” she said.

“It was this controlling relationship of love bombing and then tearing her down.”

Meanwhile, Chief Hartman said he stands by his Creve Coeur Police Department’s investigation and is waiting to hear from the St. Louis County prosecutor.