On Monday, authorities confirmed that they found the body of 73-year-old Myrtle Simmons-Brown in a creek less than 100 yards from her home, according to CBS News. The Cook County Medical Examiner's Office said Sunday that Myrtle was killed by "multiple injuries due to assault," as reported by NBC News. Her manner of death was listed as homicide.
An investigation is now underway to locate Brown, who last played for the NFL's Buffalo Bills.
Sheila Simmons, sister to Myrtle Simmons-Brown, spoke to local Chicago news outlet WGN9, and said she last spoke to her sister on Thursday, Sept. 14.
Per her recount of the days leading up to the discovery of Myrtle's body, Simmons said, “We’re going to find out what happened because it’s not normal for my sister to not answer her phone, not to respond to text messages. People have been reaching out to her since Friday. No one was able to reach her."
She continued, "Now, I got the call this morning saying that she’s missing, so immediately I came out here and find out my sister is dead.”
Simmons said she first learned that her sister and nephew were missing on Saturday morning at approximately 3 a.m. after receiving a phone call, per WGN9. She did not reveal who the call was from, however.
Simmons said she went to her sister's Maywood home that morning and noticed that things seemed "out of the ordinary," according to WGN9's report.
Additionally, she told the outlet that she conducted her own unsuccessful search of the creek before her sister's body was found later in the day.
Authorities searching for Sergio are urging anyone with information on his whereabouts to contact them. The investigation into Myrtle's death is ongoing, according to CNN.
Myrtle’s next-door neighbor, Carlos Cortez, told CBS News, "She was an outstanding woman, and I'm hoping she's in the right place and she's with God. Like I said, I never would've expected this in a million years. You only watch this on TV. And to know this happened next door, it's a tragedy.”
Like Simmons, Cortez last saw Myrtle on Thursday, Sept. 14, according to CBS. He also told the outlet that police had seen footage of Sergio on his Ring doorbell. "They seen him taking out the trash, and they seen him have a bonfire," he said.
Concern has grown for the former NFL player's health, as Cortez claimed family members had told him that Sergio “wasn't himself the last few months. He was out of his mind.”
Myrtle's son Nick Brown shared a statement on Facebook on Sunday, paying tribute to his mother and asking his brother Sergio to return home.
“Thank you, everyone, for all of your outreach, help, love and condolences,” the post began. “It's a sad but hopeful time, and we will all get through this together. Mom always told me, 'tough times don’t last' and our last conversation about tough times being temporary is my beacon of hope.”
Nick specifically thanked his mother "for being strong, caring, diligent, fancy, funny, and for saving my art," in his statement.
"I won’t let you down," Brown added. "My brother Sergio is still missing. If anyone knows where he is I want him to know that I love you and please come home.”
Sergio signed with the New England Patriots as an undrafted free agent in 2010. He also played for the Indianapolis Colts and Jacksonville Jaguars, retiring in 2017 after a final NFL season playing for the Bills.