It's been more than two years since 22-month-old Cooper Harris died in the back seat of a hot SUV outside a Cobb County office building.

His father, Ross Harris, is now on trial for his death.

Follow minute-by-minute coverage of the case below:

9:49 a.m.

The state calls it's next witness to the stand, Ray Yeager. He was a detective with the Cobb County Police Department. He is now retired and a part-time reserve officer. Yeager says he worked in the high-tech crime unit which did forensic analysis of digital devices.

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9:47 a.m.

Prosecutors point out that Harris' right side was to Houston as he left the building. Houston says there was no interaction with Harris that would make him believe that he couldn't hear him.

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9:44 a.m.

Houston says he didn't want to know anymore about the case in the day and weeks following. He says he didn't watch any news coverage about Cooper's death because it was too much for him.

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9:38 a.m.

Houston says Leanna Harris was asking, "Where's Ross? Where's my son?" in the lobby of the office. Houston says Leanna's emotions went "from hot to not" while watching the news unfold on TV.

"She was very much in control. She didn't do anything." Home Depot Sec. officer explaining

wife watching

when Cooper fnd-- Craig Lucie (@CraigLucie)

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9:33 a.m.

Houston says he talked to detectives about the events of the day and what unfolded. He says he told them Harris walked out of the Treehouse location and mentioned he was going to the movies. Houston says he knew something was wrong later when a security officer from the main office showed up at the Treehouse location with Leanna Harris. He called it a "red flag."

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9:29 a.m.

Houston says it was "out of his character" for Ross Harris to tell him he was going to the movies after work.

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9:20 a.m.

Defense cross-examines Houston. Defense Attorney Bryan Lumpkin asks Houston about his interactions with Ross Harris.

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9:18 a.m.

Houston says Leanna Harris showed no emotion while sitting in the lobby, seeing news of a dead child on the TV. He says detectives later came to speak with her.

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9:16 a.m.

Houston says the local news was on in the lobby on the day Cooper died and there was breaking news. He says there was a commotion in the office and Leanna Harris was there. Houston says Leanna Harris looked "cold." Houston says Leanna Harris "had a lot of steam" when she first came in, but then seemed to lose it.

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9:12 a.m.

Houston says he remembers Harris saying he was going to the movies with someone with the last name Mullins. Jurors see security camera video of Harris leaving the office building on the day Cooper died.

Security camera video shows

leaving work on the day Cooper died.

-- Ross Harris Trial (@RossHarrisTrial)

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9:07 a.m.

Houston says on June 18, 2014, he remembers Harris leaving the office. He told Harris to "Have a great evening." He says Harris responded, "You too." Houston says Harris told him he was going to the movies, which struck him as odd because he says Harris never told him about his activities outside of work until that day.

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9:04 a.m.

Houston says he liked to speak to the employees at the Home Depot Treehouse location. He says he remembers interacting with Ross Harris. He says he said "Hello" and "Goodbye," but they never talked about their personal lives.

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9:00 a.m.

The state calls it's first witness of the day, Wesley Houston, to the stand. Houston is a corporate security officer at Home Depot. He sometimes worked at the Little Apron Academy and was at the Treehouse office the day Cooper Harris died.

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8:50 a.m.

Trial begins with a few motions. The defense says Ross Harris has not been able to see the screen during the trial. The judge allows him to change seats.

Harris

Trial: Ross Harris complains he can't see evidence on video screens, allowed to change seats. Testimony to start.

-- Ross Cavitt | WSB-TV (@RossCavittWSB)