Two Arrested in Roseburg for Eugene and Springfield Armed Robberies

Eugene and Springfield police teamed up to catch a pair of suspected serial armed robbers in Roseburg on Wednesday night following a violent string of heists across the local area.

The multi-agency operation culminated in Roseburg, where officers tracked down the suspects’ vehicle and executed simultaneous search warrants.

Gregory Todd Dennis, 35, of Roseburg, was arrested and lodged at the Lane County Jail. He faces charges of robbery, kidnapping, unlawful use of a weapon, felon in possession of a weapon, and an outstanding warrant. Authorities booked David Lee Riggleman, 39, also of Roseburg, into the same facility on charges of robbery, kidnapping, and unlawful use of a weapon.

The crime spree began months prior, according to the Eugene Police Department. Investigators place the earliest targeted incident at Mulligan’s Pub on Willamette Street at 2:51 a.m. on Sept. 11. The sequence picked back up in November, starting with the Hilltop Market on Donald Street at 7:40 p.m. on Nov. 6. Police believe Dennis acted alone during the Hilltop Market robbery.

The suspects allegedly struck twice on the morning of Nov. 10. Officers responded to an armed robbery at Dizzy Jean Donuts on Pioneer Parkway East in Springfield at 6:21 a.m., followed shortly by another incident at Anna’s Deli on Royal Avenue at 8:21 a.m.

Springfield police identified a key piece of evidence early in the inquiry by spotting a license plate on surveillance camera footage. That breakthrough allowed detectives to build a detailed profile of both men during their movements through the area. Officers from Eugene and Springfield traveled to Roseburg to execute the follow-up investigation, grid-searching the town until they located the getaway vehicle.

Law enforcement served search warrants on two separate houses and the car. The searches yielded much of the clothing worn during the heists, along with one real firearm and two replica firearms.

The Roseburg Police Department assisted with the operation. Oregon State Police also deployed a K9 officer to aid teams processing the scene at the deli robbery.

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