"We're getting a lot of information on it," Parks told ABC News about the missing stallion investigation. "The core of the matter is trying is really trying to figure out if someone got the horse unlawfully."
Parks also suggested that authorities may have an idea where the horse is being held, but declined to provide specific details. "We do have leads as to where the horse is," he said. "We have talked to a number of parties."
Spink, a native of Canada and the man making the horse-theft allegations, is known to authorities in the area after a high-profile drug arrest in February 2005 in which he was stopped in Monroe, Wash., while carrying 372 pounds of cocaine worth an estimated $34 million in his Chevrolet Tahoe.
Spink was implicated by federal prosecutors in what they called a major cocaine-for-marijuana drug trade along the U.S.-Canada border, according to a June 2005 story in the Oregonian newspaper. Spink was described in the story as a graduate of Reed College who gained a reputation in Portland, Ore., for aggressive business dealings in the late 1990s that ultimately resulted in a bankruptcy claim as well as a love of extreme sports.
In November 2005, Spink received a three-year sentence in exchange for a guilty plea to a charge of felony drug possession.
In all, the investigation resulted in a total of four convictions, including two defense attorneys, according to the Seattle Post-Intelligencer. Spink told ABC News that he spent 21 months in prison after his guilty plea.
"It's no secret," he said. "I got in trouble and did something stupid to pay for my horses."
He did not, however, think that his arrest had any connection to Capone's disappearance.
On Exitpoint Stallions' Web site, Spink described a life that has taken him to the "highest highs and the lowest lows."
"Throughout my life, I've been an outspoken, controversial, acerbic, and some would say downright curmudgeonly presence," Spink wrote. "Much of my life has been lived in the public eye, out there for all the world to see — good and bad."
Spink described an intense relationship with Capone, whom he met nine years ago, calling him more than just a horse or an asset. He said he cannot help but fear that the animal has been injured or killed.
"We've all seen 'The Godfather,'" he said, referring to the iconic scene in which a Hollywood mogul awakes in horror to find the head of his beloved horse — severed by mobsters — in his bed.
The primarily black horse has white "socks" markings on three legs and a long, thin white blaze on his forehead. He has a brand on his left flank that includes the Holsteiner Verband "H" logo.