King, 47, of the 800 block of Oak Street in Geneva, has been charged with two counts of first-degree murder in connection with the death of his wife, Kathleen King, 32, of Geneva, on July 6.
Kane County Assistant State's Attorney Greg Sam has filed papers seeking the phone records of Shadwick and Kathleen King's phones, the Daily Herald reports.
Shadwick King has told police he confiscated Kathleen's phone following a fight at about 4 a.m. on July 6 and the phone was later found near Kathleen's body, which was located on the Union Pacific Railroad tracks in Geneva about 6:40 a.m., according to the article.
Prosecutors believe Shadwick had both his and Kathleen's phone on him at "relevant times," according to the Kane County Chronicle.
Prosectuors have requested cell tower registration records from 10:30 p.m. on July 5 to 11:30 a.m. on July 6 for both numbers to "pinpoint the location of the cellphones throughout that time period," the Kane County Chronicle reports.
Authorities said Kathleen died of asphyxiation at some point after 5 a.m. on July 6.
A Metra conductor spotted Kathleen’s body after 6:30 a.m. on July 6 on the Union Pacific Railway tracks south of Esping Park, 227 Briar Lane, according to Geneva Police. Police responded to the tracks at 6:50 a.m. where they determined Kathleen was dead.
Kathleen was the mother of three children, Brandon, Nathan and Justin, according to her obituary.
She graduated from Illinois State University with a Bachelor degree in Sociology and then obtained her M.B.A. from North Park University.. She was an Army Reservist with the 485th Engineer Company out of Arlington Heights, according to her obituary.
If convicted, King could be sentenced to 20 to 60 years in prison, prosecutors said.