Systematic investigations have been undertaken in order to evaluate the potential of low resolution NMR for characterization of biological tissue (in vitro) during early post mortem period. Test measurements from corn-oil samples are compared with computer simulated data. Furthermore, time-after-excision dependence of mouse-liver tissue is presented using the in vitro protocol developed in our laboratory. Quantitative data from biexponential model fit are shown and results are discussed in terms of the "best guess" model.