A federal jury reached a partial verdict Thursday in the tax evasion trial of "Dancing With The Stars" and two time Indianapolis 500 champ Helio Castroneves.

Federal Judge Donald Graham said he wouldn't immediately read the verdicts on two tax evasion counts against Castroneves.

He told jurors to continue deliberating on four other tax evasion counts and one conspiracy count.

The dean of the Indiana University School of Law at Indianapoils says the tax law is so complex jurors may have to make an emotional decision.

"It's almost a case that's going to turn on impressions and trust and who do you believe and who do you not believe, because they are not going to understand all of the details," Dean Gary Roberts told FOX 59 News.

The jurors left Thursday without taking further action at the end of their fifth day of deliberations.

Castroneves is charged with conspiring with his sister and lawyer to evade more than $2.3 million in U.S. income taxes.

The jury said it reached a partial verdict on charges against Katiucia Castroneves and a full verdict on charges against attorney Alan Miller.