Two Iowa 16-year-olds accused of murdering a high school Spanish teacher in early November have pleaded not guilty, according to documents filed Monday.

Willard Noble Chaiden Miller and Jeremy Everett Goodale were charged with first-degree murder and conspiracy to commit first-degree murder in the death of 66-year-old Nohema Graber on Nov. 2.

The defendants appeared in court for individual bond review hearings on Nov. 23. Each asked for his bond to be reduced from $1 million to $100,000 cash or surety.

District Court Judge Joel Yates is expected to issue a written ruling on the bond reduction requests later this week.

The teens are being charged as adults in the death of the teacher who worked at Fairfield High School, which they both attended, according to Jefferson County authorities.

Law enforcement officials said they received a tip from an associate of the two teenagers that included social media messages between Miller and Goodale allegedly sharing details of their motive and plan for killing Graber, according to a criminal complaint filed against Miller.

Graber had taught Spanish at Fairfield High School in Fairfield, Iowa, since 2012. According to online court documents, Graber was reported missing on Nov. 2 by family members.

Multiple law enforcement agencies reportedly started to search Chautauqua City Park, where Graber was known to take walks during the afternoon.

Officials later found Graber’s body in the park “concealed under a tarp, wheelbarrow and railroad ties,” according to the complaint.

Authorities determined Graber had “suffered inflicted trauma to the head.”

Miller and Goodale are set to appear for individual pre-trial conferences on March 21, and are scheduled to face a jury on April 19.