Real Estate Law
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The life tenant leasing to the tenant is likely legal as the life tenant can lease his/her interest in the property.
However, now that the life tenancy has ended, as a result of the life tenant's death, the lease would be cancelable by the remainderman.
Thus, you would have a right to evict the tenant, but you'd have to go about giving the tenant a notice to vacate and then proceed with the eviction if the tenant refuses to leave.