There is some piece on him in the Confederate Veteran Magazine, appears not to be an obituary. I do not have an index.

He appears to have become a Bushwacker later.

Beal Green Jeans

Residence was not listed;
Enlisted on 8/1/1862 as a Lieut Colonel.
On 8/1/1862 he was commissioned into Field & Staff MO 12th Cavalry
He was discharged (date not stated)
(Estimated date of commission)
He was listed as:
* Furloughed (date and place not stated)
Promotions:
* Colonel 10/1/1862 (Estimated date)

Sources used by Historical Data Systems, Inc.:
- Index to Compiled Confederate Military Service Records
- Field Officers, Regiments & Battalions of CS Army
- Confederate Veteran Magazine

12th Regiment (Hays's/Jeans's/Shanks's) (Referred to unofficially as the 2nd Regiment in the Trans-Mississippi Departmetn) "Jackson County Cavalry"

Colonel: Upson Hays, killed ca. September 13, 1862; Beal Green Jeans, resigned before August 20, 1863; David Shanks, wounded and made prisoner October 6, 1864. Lt. Col. Jeans, promoted to Colonel September 18, 17=862

Beal G. Jeans, age 40, Colonel, 12th Missouri Cavalry on enlistment

"One Beall Jeans, formerly a colonel in the Confederate service, is said to be chief among the bushwhackers in Jackson County. One Beall Jeans, formerly a colonel in the Confederate service, is said to be chief among the bushwhackers in Jackson County. I was informed by a man named James McFarland, who resides west of Bone Hill, in Jackson County, that Jeans has been in that vicinity during the past winter, and that he is recruiting for the rebel army."
OFFICIAL RECORDS: Series 1, vol 34, Part 1 (Red River Campaign)
Page 650 Chapter XLVI. LOUISIANA AND THE TRANS-MISSISSIPPI.
http://ehistory.osu.edu/osu/sources/recordView.cfm?Content=061/0650