The father and son have the same name, Andrew Sperr.
The father is listening intently to the evidence at the trial of 34 year old Anthony Horton.
The prosecution continued laying out it's case today that Horton meant to kill the state trooper who came across his path of crime.
Trooper Andrew Sperr's father finds it tough to look at all the evidence presented in Chemung County Court.
But he hopes it will convince the jury to send Horton to prison for the rest of his life.
"I know in my heart what his intentions were. And I hope that the evidence that the law requires will solidify that," says trooper Sperr's father, Andrew Sperr.
Evidence like at 357 magnum revolver investigators say was used to shoot Trooper Andrew Sperr 6 times.
Horton's defense claims he never meant to kill Sperr.
It was shortly after a robbery at the Chemung Canal Trust Bank on March 1st.
State Police say Horton robbed the bank.
District Attorney John Trice showed the jury a note Horton allegedly slipped to a bank teller.
State Police Investigators testified Horton's fingerprints were on the note and gun.
Plus, blood from Sperr, Horton, and the driver of the getaway truck were found at the scene on Lowe Road.
Sperr was killed after pulling that truck over for a loose license plate.
Investigators say Horton then fled to the Red Jacket Motel in Chemung.
That's where investigators say Horton was caught by police.
Still expected to take the stand is Horton's ex-wife.
She was with him at the Red Jacket Motel, and could prove to be a key witness.