GOLDEN, Colo. (July 27, 2026) –The First Judicial District Attorney’s Office has filed two felony theft charges against Ulises Tajonar Diaz, 32, alleging he received more than $32,000 in deposits from two Jefferson County homeowners for landscaping projects that were never started. Diaz advertised and operated landscaping businesses across the metro area under the names My Son’s Landscape and My Son’s Landscape Group LLC.
The investigation began in June when the Jefferson County Sheriff’s Office received two separate theft reports involving Diaz and My Son’s Landscaping Group. In both incidents, homeowners reported entering into contracts for residential landscaping services and paying deposits totaling over $32,000. According to the investigation, no work was performed on either project, and Diaz allegedly ceased all communication with the victims after their attempts at reimbursement.
The first allegation involves a Morrison couple who found Diaz’s business online after reviewing numerous positive customer reviews. In April, Diaz met with the couple at their residence to discuss the project, obtain measurements and provide multiple estimates for landscaping, fencing and decking work. In May, the couple decided to move forward with the project, and the couple paid the required 50% deposit of $13,302.50 through a Square payment link using their personal checking account.
According to the investigation, Diaz repeatedly delayed the project, failed to provide promised concept drawings and communicated only sporadically through text messages. After numerous unsuccessful attempts to arrange the work, the couple demanded the return of their deposit. On June 8, Diaz responded by text message indicating he would complete the project later that month but then failed to confirm that date. According to the investigation, that was the last communication the couple received from Diaz or My Son’s Landscape Group LLC.
On June 22, the couple mailed certified letters requesting cancellation of the contract and reimbursement of their deposit to multiple addresses associated with Diaz and My Son’s Landscape Group LLC. The certified letters were returned as undeliverable.
The second theft charge relates to a Golden couple, who told investigators they contacted Diaz in February 2026 regarding a large landscaping project after learning about his work from neighboring homeowners. Diaz met with the couple on multiple occasions to discuss the project, obtain measurements and review material options before providing a contract totaling $39,775.
The homeowners told police they paid Diaz the $19,000 deposit by personal check on May 2, and the project was scheduled to begin on June 9. The couple reported that Diaz never showed up, and rescheduled multiple times before he ultimately stopped communicating with them.
By June 16, the couple reported they attempted to contact Diaz by email and text message and made multiple attempts to locate him at his listed business address without success. On June 29, they too mailed certified letters requesting cancellation of the contract and reimbursement of their deposit to multiple addresses associated with Diaz and My Son’s Landscape Group LLC.
Both victims in this case allege that Diaz never began any work at their properties, and no construction materials were ever delivered in preparation for the work. Further, investigators later confirmed that no permits had been applied for or issued relating to either project.
In July, the Morrison homeowner contacted police again after he discovered that the business name on his online Estimate Rocket invoice had changed from My Son’s Landscape Group LLC, to Sunvale Outdoor Living, LLC.
Investigators later learned that Sunvale Outdoor Living LLC was established on June 28, 2026, under the name Yael Tajonar Diaz, who is believed to be a relative of the defendant.
On July 22, after review of the evidence presented, the First Judicial District Attorney’s Office charged Diaz with two counts of Felony Theft, alleging that Diaz knowingly obtained the victims’ deposits through deception and exercised control over those funds with the intent to permanently deprive the victims of their use and benefit. A warrant for Diaz’s arrest was issued the same day.
On July 23, Diaz was arrested by the Jefferson County Sheriff’s Office after he appeared for an unrelated matter. At the time of his arrest for theft, Diaz was out on a personal recognizance bond in Jefferson County, where he is facing two misdemeanor domestic violence charges from an incident on June 24, 2026. Diaz is scheduled to appear in court for that case on August 11.
In the current theft case, prosecutors requested a $10,000 cash-only bond, but a $3500 cash or surety bond was ordered. Diaz has since posted the bond and was released with the standard agreement that he appear at all future court dates. He is scheduled for a preliminary hearing in this case at 10 a.m. on Aug 19.
Further investigation, including communication with the Colorado Attorney General’s Office, revealed multiple consumer complaints involving Diaz or his landscaping businesses, as well as pending civil actions related to monetary disputes.
The investigation into Diaz and his business operations is ongoing. Anyone with information related to the allegations in this case is encouraged to contact the Jefferson County Sheriff’s Office or their local police department.
Charges
- Count 1: Theft (Class 5 felony) (value between $5,000 and $20,000.)
- Count 2: Theft (Class 5 felony) (value between $5,000 and $20,000.)
The filing of criminal charges is a formal accusation that a defendant committed a crime under Colorado law. All defendants are presumed innocent unless and until proven guilty beyond a reasonable doubt.