Robert John Crawford is accused of murdering his wife Frances by strangulation at the couple's property west of Brisbane in the early hours of July 30, 2024.
Ms Crawford's body was found by paramedics at the bottom of a retaining wall near an overturned ride-on lawnmower at 4am with Crawford attempting CPR.
The jury on Friday heard testimony from Queensland Police investigative computer analyst Sean Dalton, who examined data taken from smartphones owned by the Crawfords.
Mr Dalton said forensic data and tests of the same phone model suggested Crawford had unlocked his phone at 1:09am and 1:50am.
The data suggested Crawford unlocked his phone and opened the Signal text message app multiple times between 2:35am and 3:20am, the jury heard.
"The only test that replicated Robert Crawford's data was manual interaction with the phone and the application," Mr Dalton said.
Mr Dalton told the jury Crawford would have to enter a PIN code or use a fingerprint to unlock his model of phone.
Crawford told police he last saw his wife about 11pm on July 29 when he went to bed while she was watching TV.
Phone records show he sent a series of texts to Ms Crawford ending at 12:35am with "Hey I'm getting really sleepy".
Crawford told police officers he was a heavy sleeper and woke up "some time in the middle of the night" to find Frances no longer in bed with him.
He said he went to the toilet then searched the lounge room, back patio and a parked car.
Crawford called triple 0 at 3:35am after he discovered her underneath the lawnmower she apparently tried to move from the path of automated lawn sprinklers.
The 49-year-old psychologist and mother-of-three was declared dead at the scene when paramedics arrived.
Crawford claims his wife died from crushing injuries or traumatic asphyxia from being caught under the lawnmower's steering wheel.
Prosecutor Chris Cook has accused Crawford of fabricating text messages that night between his wife and himself to cover his tracks.
Defence barrister Saul Holt has described the messages as crucial evidence.
"Hey are you going to put mower away soon?" Ms Crawford's phone texted to her husband's phone at 11:21pm.
Crawford texted at 11:26pm "You can just turn sprinklers off if easier too XX."
Ms Crawford's phone recorded that message as 'read' six seconds after it was sent.
Mr Holt asked Mr Dalton if the phone data showed Crawford's phone's keyboard was last used at 12:35am on July 30, 2024.
"I would agree with that conclusion," Mr Dalton said.
Mr Dalton also agreed that the last online search made on Crawford's phone was at 6:10pm and was about a parkrun event.
Crawford, 49, pleaded not guilty to murder at his Brisbane Supreme Court trial which began in October.
Prosecution has now finished its case and the defence will start calling its witnesses on Monday. Crawford will not take the stand to give evidence.
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