COWETA COUNTY, Ga. - Testimony continued Monday in Coweta County in the disappearance and presumed murder of 35-year-old mother Tiffany Foster, as prosecutors laid out phone evidence and camera video they say contradicts the defense’s account of her last known movements.

Foster’s former fiancé, Reginald Robertson, and former neighbor, Jeremy Walker, are on trial.

Lead investigators in Tiffany Foster's disappearance

What they're saying:

Lead Coweta County Sheriff’s Office investigator Stacy Beckham spent the day on the stand, walking jurors through phone records pulled from the devices of Foster, Robertson and Walker.

Beckham testified that messages between Foster and Robertson changed in tone in the days before she vanished. Investigators say the relationship had deteriorated, and t

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