I have confirmed that 4-year-old Unabiding Citizen is dead after breaking down in the 6th yesterday at Thistledown. Some relevant facts:

…this was Unabiding Citizen’s 19th race of the year, almost all at the claiming level
…in that span, he was raced twice in a week two different times
…owner Jonathan Stodghill was also UC’s fourth trainer in 12 months

Exploited, exploited, exploited – killed.