CNN
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An Arizona woman has been charged with trying to murder her husband by poisoning his coffee every day for months.

Melody Felicano Johnson of Tucson was indicted by a grand jury on charges of aggravated assault and attempted first-degree murder for attempting to poison food and drink.

court document Obtained by CNN affiliate KVOA The suspect’s husband, Robbie Johnson, said he began noticing a strange taste in coffee in March while he was stationed in Germany with Melody Johnson.

Robbie Johnson serves in the U.S. Air Force, police said. The probable cause statement states that the Johnsons are still living with their child but are considering divorce.

Court documents say Robbie Johnson used pool test strips to discover that his coffee pot “showed high levels of chlorine.”

He allegedly used a hidden camera to catch Melody Johnson pouring an unknown substance into the coffee maker.

Johnson told investigators he pretended to keep drinking coffee to wait until they returned to Davis-Monthan Air Force Base on the mainland before calling police.

Robbie Johnson, who returned to the United States, said he used multiple hidden cameras over several days to “capture Melody taking the bleach out, pouring it into a container, then walking it down and pouring it into the coffee maker.” . Investigators say Robbie Johnson “believes that he tried to kill him to get his death benefit.”

Melody Johnson pleaded not guilty in an arraignment on Friday.

She was assigned a public defender, but did not immediately respond to a request for comment from CNN on Saturday. She is being held at the Pima County Jail pending her next court appearance, which is scheduled for Sept. 6.

Johnson’s bail was set at $250,000, according to court records. Prosecutors told the judge that the suspect had recently purchased a house in the Philippines near his family and needed a large bond because it was considered a flight risk.