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A Bothell man suspected of murdering his estranged wife was arrested Thursday morning.

A Bothell police spokesman said Alan Smith, 37, is in custody for investigation of first degree murder. Authorities tell KING 5 that they obtained new evidence allowing them to move forward with an arrest.

Last week, detectives served a search warrant on Alan Smith himself, to obtain inked foot impressions and castings of his feet to see if they match bloody prints left at the crime scene. According to prosecutors that evidence, along with a witness interview, enabled them to arrest Smith. He will likely be charged Friday or Monday.

Susann Smith's body was found in her home in February. Court documents reveal that Susann suffered 19 separate blunt force and sharp force wounds to her face and head. When police questioned Alan Smith the day her body was found, they noticed a recent injury to his left hand. Smith claimed his 3 year old son struck his hand with a hatched while cutting fire wood.

Court documents obtained by show that the day after Susann Smith was reported missing, Alan Smith was searching online for flights to Venezuela and for information on whether that country opposes extradition. Lab technicians also found traces of blood on his SUV's steering wheel, center console and floor mat, and records show he had purchased disposable coveralls, shoe covers and a rubber mallet prior to the murder.

Earlier this month, neighbors called 911, saying they heard a woman scream at the residence. When police arrived, they looked behind a hedge and found a couple having sex. It was Alan Smith and his new girlfriend.

Alan Smith was also arrested last week for obstruction of justice for not surrendering his passport. Smith's girlfriend said his attorney had it.

Alan and Susann Smith's two children are currently with Child Protective Services.

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